21213012211223 has 16 divisors (see below), whose sum is σ = 25670776864320. Its totient is φ = 17112185266176.

The previous prime is 21213012211219. The next prime is 21213012211277. The reversal of 21213012211223 is 32211221031212.

It is not a de Polignac number, because 21213012211223 - 2² = 21213012211219 is a prime.

It is a super-2 number, since 2×21213012211223² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213012211723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1877618 + ... + 6778751.

It is an arithmetic number, because the mean of its divisors is an integer number (1604423554020).

Almost surely, 2^{21213012211223} is an apocalyptic number.

21213012211223 is a deficient number, since it is larger than the sum of its proper divisors (4457764653097).

21213012211223 is a wasteful number, since it uses less digits than its factorization.

21213012211223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8676986.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 21213012211223 its reverse (32211221031212), we get a palindrome (53424233242435).

The spelling of 21213012211223 in words is "twenty-one trillion, two hundred thirteen billion, twelve million, two hundred eleven thousand, two hundred twenty-three".