2169541221390 has 128 divisors (see below), whose sum is σ = 5974909194240. Its totient is φ = 559615478400.

The previous prime is 2169541221377. The next prime is 2169541221403. The reversal of 2169541221390 is 931221459612.

It is a happy number.

2169541221390 is a `hidden beast` number, since 2 + 1 + 6 + 9 + 541 + 2 + 2 + 13 + 90 = 666.

It is an interprime number because it is at equal distance from previous prime (2169541221377) and next prime (2169541221403).

It is a super-2 number, since 2×2169541221390² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17859637 + ... + 17980703.

It is an arithmetic number, because the mean of its divisors is an integer number (46678978080).

Almost surely, 2^{2169541221390} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2169541221390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2987454597120).

2169541221390 is an abundant number, since it is smaller than the sum of its proper divisors (3805367972850).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2169541221390 is a wasteful number, since it uses less digits than its factorization.

2169541221390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123255 (or 123249 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The spelling of 2169541221390 in words is "two trillion, one hundred sixty-nine billion, five hundred forty-one million, two hundred twenty-one thousand, three hundred ninety".