21062545064 has 32 divisors (see below), whose sum is σ = 43788759840. Its totient is φ = 9416932800.

The previous prime is 21062545061. The next prime is 21062545099. The reversal of 21062545064 is 46054526012.

It is not an unprimeable number, because it can be changed into a prime (21062545061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1956494 + ... + 1967229.

It is an arithmetic number, because the mean of its divisors is an integer number (1368398745).

Almost surely, 2^21062545064 is an apocalyptic number.

It is an amenable number.

21062545064 is an abundant number, since it is smaller than the sum of its proper divisors (22726214776).

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

21062545064 is a wasteful number, since it uses less digits than its factorization.

21062545064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3923801 (or 3923797 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

The spelling of 21062545064 in words is "twenty-one billion, sixty-two million, five hundred forty-five thousand, sixty-four".