21045336164 has 24 divisors (see below), whose sum is σ = 37007869248. Its totient is φ = 10471700960.

The previous prime is 21045336119. The next prime is 21045336197. The reversal of 21045336164 is 46163354012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3095609 + ... + 3102399.

It is an arithmetic number, because the mean of its divisors is an integer number (1541994552).

Almost surely, 2^21045336164 is an apocalyptic number.

It is an amenable number.

21045336164 is a deficient number, since it is larger than the sum of its proper divisors (15962533084).

21045336164 is a wasteful number, since it uses less digits than its factorization.

21045336164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10435 (or 10433 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The spelling of 21045336164 in words is "twenty-one billion, forty-five million, three hundred thirty-six thousand, one hundred sixty-four".