21310305995 has 16 divisors (see below), whose sum is σ = 28116799488. Its totient is φ = 15376364640.

The previous prime is 21310305983. The next prime is 21310305997. The reversal of 21310305995 is 59950301312.

It is a happy number.

It is not a de Polignac number, because 21310305995 - 2⁴ = 21310305979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21310305997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1518449 + ... + 1532418.

It is an arithmetic number, because the mean of its divisors is an integer number (1757299968).

Almost surely, 2^21310305995 is an apocalyptic number.

21310305995 is a deficient number, since it is larger than the sum of its proper divisors (6806493493).

21310305995 is a wasteful number, since it uses less digits than its factorization.

21310305995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3051010.

The product of its (nonzero) digits is 36450, while the sum is 38.

The spelling of 21310305995 in words is "twenty-one billion, three hundred ten million, three hundred five thousand, nine hundred ninety-five".