21050311204 has 24 divisors (see below), whose sum is σ = 41759728640. Its totient is φ = 9204184224.

The previous prime is 21050311201. The next prime is 21050311213. The reversal of 21050311204 is 40211305012.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (21050311201) 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, 10652004 + ... + 10653979.

Almost surely, 2^21050311204 is an apocalyptic number.

It is an amenable number.

21050311204 is a deficient number, since it is larger than the sum of its proper divisors (20709417436).

21050311204 is a wasteful number, since it uses less digits than its factorization.

21050311204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21306019 (or 21306017 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 21050311204 its reverse (40211305012), we get a palindrome (61261616216).

The spelling of 21050311204 in words is "twenty-one billion, fifty million, three hundred eleven thousand, two hundred four".