21315253311 has 24 divisors (see below), whose sum is σ = 33761731536. Its totient is φ = 12851389440.

The previous prime is 21315253301. The next prime is 21315253331. The reversal of 21315253311 is 11335251312.

21315253311 is a `hidden beast` number, since 2 + 131 + 525 + 3 + 3 + 1 + 1 = 666.

It is not a de Polignac number, because 21315253311 - 2¹¹ = 21315251263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21315253301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 538680 + ... + 576893.

It is an arithmetic number, because the mean of its divisors is an integer number (1406738814).

Almost surely, 2^21315253311 is an apocalyptic number.

21315253311 is a deficient number, since it is larger than the sum of its proper divisors (12446478225).

21315253311 is a wasteful number, since it uses less digits than its factorization.

21315253311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1115783 (or 1115780 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

The spelling of 21315253311 in words is "twenty-one billion, three hundred fifteen million, two hundred fifty-three thousand, three hundred eleven".