21108954315 has 32 divisors (see below), whose sum is σ = 35773456896. Its totient is φ = 10592192000.

The previous prime is 21108954311. The next prime is 21108954319. The reversal of 21108954315 is 51345980112.

It is an interprime number because it is at equal distance from previous prime (21108954311) and next prime (21108954319).

It is not a de Polignac number, because 21108954315 - 2² = 21108954311 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21108954311) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 816274 + ... + 841736.

It is an arithmetic number, because the mean of its divisors is an integer number (1117920528).

Almost surely, 2^21108954315 is an apocalyptic number.

21108954315 is a deficient number, since it is larger than the sum of its proper divisors (14664502581).

21108954315 is a wasteful number, since it uses less digits than its factorization.

21108954315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28739.

The product of its (nonzero) digits is 43200, while the sum is 39.

The spelling of 21108954315 in words is "twenty-one billion, one hundred eight million, nine hundred fifty-four thousand, three hundred fifteen".