21137502404 has 6 divisors (see below), whose sum is σ = 36990629214. Its totient is φ = 10568751200.

The previous prime is 21137502391. The next prime is 21137502433. The reversal of 21137502404 is 40420573112.

It can be written as a sum of positive squares in only one way, i.e., 19965124804 + 1172377600 = 141298^2 + 34240^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2642187797 + ... + 2642187804.

It is an arithmetic number, because the mean of its divisors is an integer number (6165104869).

Almost surely, 2^21137502404 is an apocalyptic number.

It is an amenable number.

21137502404 is a deficient number, since it is larger than the sum of its proper divisors (15853126810).

21137502404 is a wasteful number, since it uses less digits than its factorization.

21137502404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5284375605 (or 5284375603 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The spelling of 21137502404 in words is "twenty-one billion, one hundred thirty-seven million, five hundred two thousand, four hundred four".