21925116 has 36 divisors (see below), whose sum is σ = 55564600. Its totient is φ = 7289568.

The previous prime is 21925103. The next prime is 21925117. The reversal of 21925116 is 61152912.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×21925116² = 961421423226912, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21925116.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21925117) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25095 + ... + 25953.

Almost surely, 2^21925116 is an apocalyptic number.

It is an amenable number.

21925116 is an abundant number, since it is smaller than the sum of its proper divisors (33639484).

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

21925116 is a wasteful number, since it uses less digits than its factorization.

21925116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1578 (or 1573 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 21925116 is about 4682.4262941343. The cubic root of 21925116 is about 279.8856505860.

The spelling of 21925116 in words is "twenty-one million, nine hundred twenty-five thousand, one hundred sixteen".