21310571506 has 16 divisors (see below), whose sum is σ = 36596626560. Its totient is φ = 9117047520.

The previous prime is 21310571479. The next prime is 21310571519. The reversal of 21310571506 is 60517501312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1329630 + ... + 1345561.

It is an arithmetic number, because the mean of its divisors is an integer number (2287289160).

Almost surely, 2^21310571506 is an apocalyptic number.

21310571506 is a deficient number, since it is larger than the sum of its proper divisors (15286055054).

21310571506 is a wasteful number, since it uses less digits than its factorization.

21310571506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2675769.

The product of its (nonzero) digits is 6300, while the sum is 31.

The spelling of 21310571506 in words is "twenty-one billion, three hundred ten million, five hundred seventy-one thousand, five hundred six".