21020504132 has 6 divisors (see below), whose sum is σ = 36785882238. Its totient is φ = 10510252064.

The previous prime is 21020504107. The next prime is 21020504171. The reversal of 21020504132 is 23140502012.

It can be written as a sum of positive squares in only one way, i.e., 11129406016 + 9891098116 = 105496^2 + 99454^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2627563013 + ... + 2627563020.

It is an arithmetic number, because the mean of its divisors is an integer number (6130980373).

Almost surely, 2^21020504132 is an apocalyptic number.

It is an amenable number.

21020504132 is a deficient number, since it is larger than the sum of its proper divisors (15765378106).

21020504132 is a wasteful number, since it uses less digits than its factorization.

21020504132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5255126037 (or 5255126035 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The spelling of 21020504132 in words is "twenty-one billion, twenty million, five hundred four thousand, one hundred thirty-two".