21232100115 has 24 divisors (see below), whose sum is σ = 37405628208. Its totient is φ = 11138149440.

The previous prime is 21232100111. The next prime is 21232100159. The reversal of 21232100115 is 51100123212.

It is not a de Polignac number, because 21232100115 - 2² = 21232100111 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21232100111) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3864669 + ... + 3870158.

It is an arithmetic number, because the mean of its divisors is an integer number (1558567842).

Almost surely, 2^21232100115 is an apocalyptic number.

21232100115 is a deficient number, since it is larger than the sum of its proper divisors (16173528093).

21232100115 is a wasteful number, since it uses less digits than its factorization.

21232100115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7734899 (or 7734896 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

Adding to 21232100115 its reverse (51100123212), we get a palindrome (72332223327).

The spelling of 21232100115 in words is "twenty-one billion, two hundred thirty-two million, one hundred thousand, one hundred fifteen".