21213612325115 has 32 divisors (see below), whose sum is σ = 29242025809920. Its totient is φ = 14471948179584.

The previous prime is 21213612325051. The next prime is 21213612325117. The reversal of 21213612325115 is 51152321631212.

It is not a de Polignac number, because 21213612325115 - 2⁶ = 21213612325051 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is not an unprimeable number, because it can be changed into a prime (21213612325117) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 175231076 + ... + 175352094.

It is an arithmetic number, because the mean of its divisors is an integer number (913813306560).

Almost surely, 2^{21213612325115} is an apocalyptic number.

21213612325115 is a deficient number, since it is larger than the sum of its proper divisors (8028413484805).

21213612325115 is a wasteful number, since it uses less digits than its factorization.

21213612325115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146651.

The product of its digits is 21600, while the sum is 35.

Adding to 21213612325115 its reverse (51152321631212), we get a palindrome (72365933956327).

The spelling of 21213612325115 in words is "twenty-one trillion, two hundred thirteen billion, six hundred twelve million, three hundred twenty-five thousand, one hundred fifteen".