21222123012213 has 64 divisors (see below), whose sum is σ = 31802512896000. Its totient is φ = 12517332157440.

The previous prime is 21222123012191. The next prime is 21222123012289. The reversal of 21222123012213 is 31221032122212.

It is not a de Polignac number, because 21222123012213 - 2²⁴ = 21222106234997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222123012613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 245018688 + ... + 245105286.

It is an arithmetic number, because the mean of its divisors is an integer number (496914264000).

Almost surely, 2^{21222123012213} is an apocalyptic number.

21222123012213 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21222123012213 is a deficient number, since it is larger than the sum of its proper divisors (10580389883787).

21222123012213 is a wasteful number, since it uses less digits than its factorization.

21222123012213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90242.

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21222123012213 its reverse (31221032122212), we get a palindrome (52443155134425).

The spelling of 21222123012213 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty-three million, twelve thousand, two hundred thirteen".