21054435052 has 18 divisors (see below), whose sum is σ = 42860814612. Its totient is φ = 9023329224.

The previous prime is 21054435001. The next prime is 21054435091. The reversal of 21054435052 is 25053445012.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53710098 + ... + 53710489.

Almost surely, 2^21054435052 is an apocalyptic number.

It is an amenable number.

21054435052 is an abundant number, since it is smaller than the sum of its proper divisors (21806379560).

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

21054435052 is a wasteful number, since it uses less digits than its factorization.

21054435052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107420605 (or 107420596 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 31.

The spelling of 21054435052 in words is "twenty-one billion, fifty-four million, four hundred thirty-five thousand, fifty-two".