21302512345 has 16 divisors (see below), whose sum is σ = 25933340160. Its totient is φ = 16795905984.

The previous prime is 21302512333. The next prime is 21302512369. The reversal of 21302512345 is 54321520312.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21302512345 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, 171604 + ... + 268426.

It is an arithmetic number, because the mean of its divisors is an integer number (1620833760).

Almost surely, 2^21302512345 is an apocalyptic number.

It is an amenable number.

21302512345 is a deficient number, since it is larger than the sum of its proper divisors (4630827815).

21302512345 is an equidigital number, since it uses as much as digits as its factorization.

21302512345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97464.

The product of its (nonzero) digits is 7200, while the sum is 28.

The spelling of 21302512345 in words is "twenty-one billion, three hundred two million, five hundred twelve thousand, three hundred forty-five".