21050511344 has 20 divisors (see below), whose sum is σ = 40801622160. Its totient is φ = 10521060480.

The previous prime is 21050511299. The next prime is 21050511347. The reversal of 21050511344 is 44311505012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21050511347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220604 + ... + 301275.

It is an arithmetic number, because the mean of its divisors is an integer number (2040081108).

Almost surely, 2^21050511344 is an apocalyptic number.

It is an amenable number.

21050511344 is a deficient number, since it is larger than the sum of its proper divisors (19751110816).

21050511344 is a wasteful number, since it uses less digits than its factorization.

21050511344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524408 (or 524402 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The spelling of 21050511344 in words is "twenty-one billion, fifty million, five hundred eleven thousand, three hundred forty-four".