21236015550051 has 12 divisors (see below), whose sum is σ = 30674392278712. Its totient is φ = 14157275579136.

The previous prime is 21236015550037. The next prime is 21236015550067. The reversal of 21236015550051 is 15005551063212.

21236015550051 is a `hidden beast` number, since 2 + 12 + 36 + 0 + 15 + 550 + 0 + 51 = 666.

It is not a de Polignac number, because 21236015550051 - 2²² = 21236011355747 is a prime.

It is a super-2 number, since 2×21236015550051² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21236015549988 and 21236015550015.

It is not an unprimeable number, because it can be changed into a prime (21236015350051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3664861 + ... + 7476846.

Almost surely, 2^{21236015550051} is an apocalyptic number.

21236015550051 is a deficient number, since it is larger than the sum of its proper divisors (9438376728661).

21236015550051 is a wasteful number, since it uses less digits than its factorization.

21236015550051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11353490 (or 11353487 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

The spelling of 21236015550051 in words is "twenty-one trillion, two hundred thirty-six billion, fifteen million, five hundred fifty thousand, fifty-one".