21154863315 has 16 divisors (see below), whose sum is σ = 33850116000. Its totient is φ = 11281815552.

The previous prime is 21154863313. The next prime is 21154863347. The reversal of 21154863315 is 51336845112.

It is not a de Polignac number, because 21154863315 - 2¹ = 21154863313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21154863313) 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, 226161 + ... + 305709.

It is an arithmetic number, because the mean of its divisors is an integer number (2115632250).

Almost surely, 2^21154863315 is an apocalyptic number.

21154863315 is a deficient number, since it is larger than the sum of its proper divisors (12695252685).

21154863315 is a wasteful number, since it uses less digits than its factorization.

21154863315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97286.

The product of its digits is 86400, while the sum is 39.

The spelling of 21154863315 in words is "twenty-one billion, one hundred fifty-four million, eight hundred sixty-three thousand, three hundred fifteen".