21256030426051 has 16 divisors (see below), whose sum is σ = 21613247027424. Its totient is φ = 20900620733184.

The previous prime is 21256030426019. The next prime is 21256030426067. The reversal of 21256030426051 is 15062403065212.

It is a cyclic number.

It is not a de Polignac number, because 21256030426051 - 2⁵ = 21256030426019 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21256030426051.

It is not an unprimeable number, because it can be changed into a prime (21256030426751) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144135685 + ... + 144283081.

It is an arithmetic number, because the mean of its divisors is an integer number (1350827939214).

Almost surely, 2^{21256030426051} is an apocalyptic number.

21256030426051 is a deficient number, since it is larger than the sum of its proper divisors (357216601373).

21256030426051 is a wasteful number, since it uses less digits than its factorization.

21256030426051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153510.

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 21256030426051 in words is "twenty-one trillion, two hundred fifty-six billion, thirty million, four hundred twenty-six thousand, fifty-one".