21310571505 has 32 divisors (see below), whose sum is σ = 34864187904. Its totient is φ = 11110461696.

The previous prime is 21310571479. The next prime is 21310571519. The reversal of 21310571505 is 50517501312.

It is not a de Polignac number, because 21310571505 - 2⁷ = 21310571377 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 583647 + ... + 619083.

It is an arithmetic number, because the mean of its divisors is an integer number (1089505872).

Almost surely, 2^21310571505 is an apocalyptic number.

It is an amenable number.

21310571505 is a deficient number, since it is larger than the sum of its proper divisors (13553616399).

21310571505 is a wasteful number, since it uses less digits than its factorization.

21310571505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36345.

The product of its (nonzero) digits is 5250, while the sum is 30.

The spelling of 21310571505 in words is "twenty-one billion, three hundred ten million, five hundred seventy-one thousand, five hundred five".