21056054054456 has 32 divisors (see below), whose sum is σ = 43243924410000. Its totient is φ = 9567050927616.

The previous prime is 21056054054447. The next prime is 21056054054489. The reversal of 21056054054456 is 65445045065012.

It is a super-3 number, since 3×21056054054456³ (a number of 41 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21056054054456.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2669374106 + ... + 2669381993.

Almost surely, 2^{21056054054456} is an apocalyptic number.

It is an amenable number.

21056054054456 is an abundant number, since it is smaller than the sum of its proper divisors (22187870355544).

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

21056054054456 is a wasteful number, since it uses less digits than its factorization.

21056054054456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5338756151 (or 5338756147 counting only the distinct ones).

The product of its (nonzero) digits is 2880000, while the sum is 47.

The spelling of 21056054054456 in words is "twenty-one trillion, fifty-six billion, fifty-four million, fifty-four thousand, four hundred fifty-six".