21225754616 has 16 divisors (see below), whose sum is σ = 43416316440. Its totient is φ = 9648070240.

The previous prime is 21225754607. The next prime is 21225754679. The reversal of 21225754616 is 61645752212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120600791 + ... + 120600966.

Almost surely, 2^21225754616 is an apocalyptic number.

It is an amenable number.

21225754616 is an abundant number, since it is smaller than the sum of its proper divisors (22190561824).

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

21225754616 is a wasteful number, since it uses less digits than its factorization.

21225754616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241201774 (or 241201770 counting only the distinct ones).

The product of its digits is 201600, while the sum is 41.

The spelling of 21225754616 in words is "twenty-one billion, two hundred twenty-five million, seven hundred fifty-four thousand, six hundred sixteen".