21450000015 has 48 divisors (see below), whose sum is σ = 38759325696. Its totient is φ = 11379981600.

The previous prime is 21450000001. The next prime is 21450000023. The reversal of 21450000015 is 51000005412.

It is not a de Polignac number, because 21450000015 - 2⁹ = 21449999503 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 185850 + ... + 278280.

It is an arithmetic number, because the mean of its divisors is an integer number (807485952).

Almost surely, 2^21450000015 is an apocalyptic number.

21450000015 is a deficient number, since it is larger than the sum of its proper divisors (17309325681).

21450000015 is an equidigital number, since it uses as much as digits as its factorization.

21450000015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92642 (or 92630 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

Adding to 21450000015 its reverse (51000005412), we get a palindrome (72450005427).

The spelling of 21450000015 in words is "twenty-one billion, four hundred fifty million, fifteen", and thus it is an aban number.