21252561551152 has 10 divisors (see below), whose sum is σ = 41176838005388. Its totient is φ = 10626280775568.

The previous prime is 21252561551129. The next prime is 21252561551201. The reversal of 21252561551152 is 25115516525212.

It is a junction number, because it is equal to n+sod(n) for n = 21252561551099 and 21252561551108.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 664142548458 + ... + 664142548489.

Almost surely, 2^{21252561551152} is an apocalyptic number.

It is an amenable number.

21252561551152 is a deficient number, since it is larger than the sum of its proper divisors (19924276454236).

21252561551152 is a wasteful number, since it uses less digits than its factorization.

21252561551152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328285096955 (or 1328285096949 counting only the distinct ones).

The product of its digits is 300000, while the sum is 43.

The spelling of 21252561551152 in words is "twenty-one trillion, two hundred fifty-two billion, five hundred sixty-one million, five hundred fifty-one thousand, one hundred fifty-two".