21064751115546 has 32 divisors (see below), whose sum is σ = 42221103095808. Its totient is φ = 7006317884720.

The previous prime is 21064751115521. The next prime is 21064751115557. The reversal of 21064751115546 is 64551115746012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21064751115495 and 21064751115504.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99452071 + ... + 99663653.

It is an arithmetic number, because the mean of its divisors is an integer number (1319409471744).

Almost surely, 2^{21064751115546} is an apocalyptic number.

21064751115546 is an abundant number, since it is smaller than the sum of its proper divisors (21156351980262).

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

21064751115546 is a wasteful number, since it uses less digits than its factorization.

21064751115546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247586.

The product of its (nonzero) digits is 1008000, while the sum is 48.

The spelling of 21064751115546 in words is "twenty-one trillion, sixty-four billion, seven hundred fifty-one million, one hundred fifteen thousand, five hundred forty-six".