21065075062064 has 40 divisors (see below), whose sum is σ = 44578944689040. Its totient is φ = 9563198412800.

The previous prime is 21065075062061. The next prime is 21065075062159. The reversal of 21065075062064 is 46026057056012.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (21065075062061) 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, 73830377 + ... + 74115144.

It is an arithmetic number, because the mean of its divisors is an integer number (1114473617226).

Almost surely, 2^{21065075062064} is an apocalyptic number.

It is an amenable number.

21065075062064 is an abundant number, since it is smaller than the sum of its proper divisors (23513869626976).

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

21065075062064 is a wasteful number, since it uses less digits than its factorization.

21065075062064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147946349 (or 147946343 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 44.

The spelling of 21065075062064 in words is "twenty-one trillion, sixty-five billion, seventy-five million, sixty-two thousand, sixty-four".