21415315497 has 16 divisors (see below), whose sum is σ = 30616093440. Its totient is φ = 13266968832.

The previous prime is 21415315489. The next prime is 21415315501. The reversal of 21415315497 is 79451351412.

It is not a de Polignac number, because 21415315497 - 2³ = 21415315489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21415315417) 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, 2653618 + ... + 2661675.

It is an arithmetic number, because the mean of its divisors is an integer number (1913505840).

Almost surely, 2^21415315497 is an apocalyptic number.

It is an amenable number.

21415315497 is a deficient number, since it is larger than the sum of its proper divisors (9200777943).

21415315497 is a wasteful number, since it uses less digits than its factorization.

21415315497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5315392.

The product of its digits is 151200, while the sum is 42.

The spelling of 21415315497 in words is "twenty-one billion, four hundred fifteen million, three hundred fifteen thousand, four hundred ninety-seven".