21154326315 has 16 divisors (see below), whose sum is σ = 33851439648. Its totient is φ = 11280801536.

The previous prime is 21154326301. The next prime is 21154326353. The reversal of 21154326315 is 51362345112.

It is a cyclic number.

It is not a de Polignac number, because 21154326315 - 2⁷ = 21154326187 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, 27049 + ... + 207461.

It is an arithmetic number, because the mean of its divisors is an integer number (2115714978).

Almost surely, 2^21154326315 is an apocalyptic number.

21154326315 is a deficient number, since it is larger than the sum of its proper divisors (12697113333).

21154326315 is a wasteful number, since it uses less digits than its factorization.

21154326315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188238.

The product of its digits is 21600, while the sum is 33.

The spelling of 21154326315 in words is "twenty-one billion, one hundred fifty-four million, three hundred twenty-six thousand, three hundred fifteen".