21213012211231 has 8 divisors (see below), whose sum is σ = 21317057632640. Its totient is φ = 21109046431392.

The previous prime is 21213012211219. The next prime is 21213012211277. The reversal of 21213012211231 is 13211221031212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21213012211231 - 2²⁵ = 21212978656799 is a prime.

It is a super-2 number, since 2×21213012211231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213012211331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19376340 + ... + 20441833.

It is an arithmetic number, because the mean of its divisors is an integer number (2664632204080).

Almost surely, 2^{21213012211231} is an apocalyptic number.

21213012211231 is a deficient number, since it is larger than the sum of its proper divisors (104045421409).

21213012211231 is a wasteful number, since it uses less digits than its factorization.

21213012211231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39820785.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 21213012211231 its reverse (13211221031212), we get a palindrome (34424233242443).

The spelling of 21213012211231 in words is "twenty-one trillion, two hundred thirteen billion, twelve million, two hundred eleven thousand, two hundred thirty-one".