21011212304 has 40 divisors (see below), whose sum is σ = 41627525400. Its totient is φ = 10270061568.

The previous prime is 21011212297. The next prime is 21011212331. The reversal of 21011212304 is 40321211012.

It can be written as a sum of positive squares in 4 ways, for example, as 5172486400 + 15838725904 = 71920^2 + 125852^2 .

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, 190172 + ... + 279620.

It is an arithmetic number, because the mean of its divisors is an integer number (1040688135).

Almost surely, 2^21011212304 is an apocalyptic number.

It is an amenable number.

21011212304 is a deficient number, since it is larger than the sum of its proper divisors (20616313096).

21011212304 is a wasteful number, since it uses less digits than its factorization.

21011212304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89787 (or 89781 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21011212304 its reverse (40321211012), we get a palindrome (61332423316).

The spelling of 21011212304 in words is "twenty-one billion, eleven million, two hundred twelve thousand, three hundred four".