21064606458 has 32 divisors (see below), whose sum is σ = 48825815040. Its totient is φ = 5933691120.

The previous prime is 21064606447. The next prime is 21064606471. The reversal of 21064606458 is 85460646012.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3528978 + ... + 3534941.

It is an arithmetic number, because the mean of its divisors is an integer number (1525806720).

Almost surely, 2^21064606458 is an apocalyptic number.

21064606458 is an abundant number, since it is smaller than the sum of its proper divisors (27761208582).

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

21064606458 is a wasteful number, since it uses less digits than its factorization.

21064606458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7064002.

The product of its (nonzero) digits is 276480, while the sum is 42.

The spelling of 21064606458 in words is "twenty-one billion, sixty-four million, six hundred six thousand, four hundred fifty-eight".