21955490316 has 72 divisors (see below), whose sum is σ = 57940755600. Its totient is φ = 7269331392.

The previous prime is 21955490311. The next prime is 21955490339. The reversal of 21955490316 is 61309455912.

21955490316 is a `hidden beast` number, since 2 + 1 + 9 + 554 + 90 + 3 + 1 + 6 = 666.

It is not an unprimeable number, because it can be changed into a prime (21955490311) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69030 + ... + 220626.

Almost surely, 2^21955490316 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 21955490316, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28970377800).

21955490316 is an abundant number, since it is smaller than the sum of its proper divisors (35985265284).

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

21955490316 is a wasteful number, since it uses less digits than its factorization.

21955490316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151765 (or 151751 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The spelling of 21955490316 in words is "twenty-one billion, nine hundred fifty-five million, four hundred ninety thousand, three hundred sixteen".