21890690316 has 180 divisors, whose sum is σ = 64440878040. Its totient is φ = 6471273600.

The previous prime is 21890690287. The next prime is 21890690317. The reversal of 21890690316 is 61309609812.

It is a happy number.

It is a super-2 number, since 2×21890690316² (a number of 21 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 not an unprimeable number, because it can be changed into a prime (21890690317) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 1600555 + ... + 1614173.

It is an arithmetic number, because the mean of its divisors is an integer number (358004878).

Almost surely, 2^21890690316 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21890690316, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32220439020).

21890690316 is an abundant number, since it is smaller than the sum of its proper divisors (42550187724).

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

21890690316 is a wasteful number, since it uses less digits than its factorization.

21890690316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13698 (or 13676 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The spelling of 21890690316 in words is "twenty-one billion, eight hundred ninety million, six hundred ninety thousand, three hundred sixteen".