2154122250 has 128 divisors (see below), whose sum is σ = 6232412160. Its totient is φ = 485352000.

The previous prime is 2154122249. The next prime is 2154122251. The reversal of 2154122250 is 522214512.

It is an interprime number because it is at equal distance from previous prime (2154122249) and next prime (2154122251).

It is a self number, because there is not a number n which added to its sum of digits gives 2154122250.

It is not an unprimeable number, because it can be changed into a prime (2154122251) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 369861 + ... + 375639.

It is an arithmetic number, because the mean of its divisors is an integer number (48690720).

Almost surely, 2^2154122250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2154122250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3116206080).

2154122250 is an abundant number, since it is smaller than the sum of its proper divisors (4078289910).

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

2154122250 is a wasteful number, since it uses less digits than its factorization.

2154122250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5877 (or 5867 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 2154122250 is about 46412.5225558792. The cubic root of 2154122250 is about 1291.4872277038.

Adding to 2154122250 its reverse (522214512), we get a palindrome (2676336762).

The spelling of 2154122250 in words is "two billion, one hundred fifty-four million, one hundred twenty-two thousand, two hundred fifty".