21455005105552 has 20 divisors (see below), whose sum is σ = 44014311945036. Its totient is φ = 10096472990720.

The previous prime is 21455005105507. The next prime is 21455005105579. The reversal of 21455005105552 is 25550150055412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13132680201216 + 8322324904336 = 3623904^2 + 2884844^2 .

It is a super-2 number, since 2×21455005105552² (a number of 27 digits) contains 22 as substring.

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, 39439347349 + ... + 39439347892.

Almost surely, 2^{21455005105552} is an apocalyptic number.

It is an amenable number.

21455005105552 is an abundant number, since it is smaller than the sum of its proper divisors (22559306839484).

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

21455005105552 is a wasteful number, since it uses less digits than its factorization.

21455005105552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78878695266 (or 78878695260 counting only the distinct ones).

The product of its (nonzero) digits is 250000, while the sum is 40.

The spelling of 21455005105552 in words is "twenty-one trillion, four hundred fifty-five billion, five million, one hundred five thousand, five hundred fifty-two".