21213122131213 has 8 divisors (see below), whose sum is σ = 21312927776480. Its totient is φ = 21113378850960.

The previous prime is 21213122131181. The next prime is 21213122131219. The reversal of 21213122131213 is 31213122131212.

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 21213122131213 - 2⁵ = 21213122131181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213122131219) 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, 14909295 + ... + 16270012.

It is an arithmetic number, because the mean of its divisors is an integer number (2664115972060).

Almost surely, 2^{21213122131213} is an apocalyptic number.

It is an amenable number.

21213122131213 is a deficient number, since it is larger than the sum of its proper divisors (99805645267).

21213122131213 is a wasteful number, since it uses less digits than its factorization.

21213122131213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31182507.

The product of its digits is 864, while the sum is 25.

Adding to 21213122131213 its reverse (31213122131212), we get a palindrome (52426244262425).

Subtracting 21213122131213 from its reverse (31213122131212), we obtain a palindrome (9999999999999).

The spelling of 21213122131213 in words is "twenty-one trillion, two hundred thirteen billion, one hundred twenty-two million, one hundred thirty-one thousand, two hundred thirteen".