21159515311 has 16 divisors (see below), whose sum is σ = 23930818560. Its totient is φ = 18532372320.

The previous prime is 21159515309. The next prime is 21159515347. The reversal of 21159515311 is 11351595112.

It is not a de Polignac number, because 21159515311 - 2¹ = 21159515309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21159515371) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 76066 + ... + 219328.

It is an arithmetic number, because the mean of its divisors is an integer number (1495676160).

Almost surely, 2^21159515311 is an apocalyptic number.

21159515311 is a deficient number, since it is larger than the sum of its proper divisors (2771303249).

21159515311 is a wasteful number, since it uses less digits than its factorization.

21159515311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143766.

The product of its digits is 6750, while the sum is 34.

The spelling of 21159515311 in words is "twenty-one billion, one hundred fifty-nine million, five hundred fifteen thousand, three hundred eleven".