21065747346 has 24 divisors (see below), whose sum is σ = 52162803264. Its totient is φ = 6018784920.

The previous prime is 21065747309. The next prime is 21065747363. The reversal of 21065747346 is 64374756012.

21065747346 is a `hidden beast` number, since 2 + 1 + 0 + 6 + 574 + 73 + 4 + 6 = 666.

It is a super-2 number, since 2×21065747346² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83594110 + ... + 83594361.

It is an arithmetic number, because the mean of its divisors is an integer number (2173450136).

Almost surely, 2^21065747346 is an apocalyptic number.

21065747346 is an abundant number, since it is smaller than the sum of its proper divisors (31097055918).

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

21065747346 is a wasteful number, since it uses less digits than its factorization.

21065747346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167188486 (or 167188483 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 45.

The spelling of 21065747346 in words is "twenty-one billion, sixty-five million, seven hundred forty-seven thousand, three hundred forty-six".