21051766765062 has 48 divisors (see below), whose sum is σ = 51103551771792. Its totient is φ = 6206909117760.

The previous prime is 21051766765039. The next prime is 21051766765069. The reversal of 21051766765062 is 26056766715012.

It is a happy number.

21051766765062 is a `hidden beast` number, since 2 + 1 + 0 + 5 + 1 + 7 + 66 + 76 + 506 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21051766765069) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1436777193 + ... + 1436791844.

It is an arithmetic number, because the mean of its divisors is an integer number (1064657328579).

Almost surely, 2^{21051766765062} is an apocalyptic number.

21051766765062 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21051766765062 is an abundant number, since it is smaller than the sum of its proper divisors (30051785006730).

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

21051766765062 is a wasteful number, since it uses less digits than its factorization.

21051766765062 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2873569093 (or 2873569090 counting only the distinct ones).

The product of its (nonzero) digits is 6350400, while the sum is 54.

The spelling of 21051766765062 in words is "twenty-one trillion, fifty-one billion, seven hundred sixty-six million, seven hundred sixty-five thousand, sixty-two".