21526621428352 has 16 divisors (see below), whose sum is σ = 42885066127050. Its totient is φ = 10763310714112.

The previous prime is 21526621428337. The next prime is 21526621428379. The reversal of 21526621428352 is 25382412662512.

It can be written as a sum of positive squares in only one way, i.e., 20750065690176 + 776555738176 = 4555224^2 + 881224^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a junction number, because it is equal to n+sod(n) for n = 21526621428296 and 21526621428305.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84088364827 + ... + 84088365082.

Almost surely, 2^{21526621428352} is an apocalyptic number.

It is an amenable number.

21526621428352 is a deficient number, since it is larger than the sum of its proper divisors (21358444698698).

21526621428352 is an equidigital number, since it uses as much as digits as its factorization.

21526621428352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168176729923 (or 168176729911 counting only the distinct ones).

The product of its digits is 2764800, while the sum is 49.

The spelling of 21526621428352 in words is "twenty-one trillion, five hundred twenty-six billion, six hundred twenty-one million, four hundred twenty-eight thousand, three hundred fifty-two".