21232250515 has 16 divisors (see below), whose sum is σ = 29712772800. Its totient is φ = 14559256320.

The previous prime is 21232250497. The next prime is 21232250539. The reversal of 21232250515 is 51505223212.

It is not a de Polignac number, because 21232250515 - 2⁷ = 21232250387 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, 6188446 + ... + 6191875.

It is an arithmetic number, because the mean of its divisors is an integer number (1857048300).

Almost surely, 2^21232250515 is an apocalyptic number.

21232250515 is a deficient number, since it is larger than the sum of its proper divisors (8480522285).

21232250515 is an equidigital number, since it uses as much as digits as its factorization.

21232250515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12380347 (or 12380333 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

Adding to 21232250515 its reverse (51505223212), we get a palindrome (72737473727).

The spelling of 21232250515 in words is "twenty-one billion, two hundred thirty-two million, two hundred fifty thousand, five hundred fifteen".