21345521115 has 16 divisors (see below), whose sum is σ = 34329796128. Its totient is φ = 11325290496.

The previous prime is 21345521069. The next prime is 21345521123. The reversal of 21345521115 is 51112554312.

It is not a de Polignac number, because 21345521115 - 2¹¹ = 21345519067 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3683724 + ... + 3689513.

It is an arithmetic number, because the mean of its divisors is an integer number (2145612258).

Almost surely, 2^21345521115 is an apocalyptic number.

21345521115 is a deficient number, since it is larger than the sum of its proper divisors (12984275013).

21345521115 is a wasteful number, since it uses less digits than its factorization.

21345521115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7373438.

The product of its digits is 6000, while the sum is 30.

The spelling of 21345521115 in words is "twenty-one billion, three hundred forty-five million, five hundred twenty-one thousand, one hundred fifteen".