21213211313223 has 12 divisors (see below), whose sum is σ = 30644969252040. Its totient is φ = 14140449788496.

The previous prime is 21213211313201. The next prime is 21213211313279. The reversal of 21213211313223 is 32231311231212.

21213211313223 is a `hidden beast` number, since 2 + 1 + 2 + 1 + 321 + 1 + 313 + 2 + 23 = 666.

It is not a de Polignac number, because 21213211313223 - 2¹² = 21213211309127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213210313223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 140844468 + ... + 140995001.

It is an arithmetic number, because the mean of its divisors is an integer number (2553747437670).

Almost surely, 2^{21213211313223} is an apocalyptic number.

21213211313223 is a deficient number, since it is larger than the sum of its proper divisors (9431757938817).

21213211313223 is a wasteful number, since it uses less digits than its factorization.

21213211313223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281847838 (or 281847835 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

Adding to 21213211313223 its reverse (32231311231212), we get a palindrome (53444522544435).

The spelling of 21213211313223 in words is "twenty-one trillion, two hundred thirteen billion, two hundred eleven million, three hundred thirteen thousand, two hundred twenty-three".