213112112021 has 2 divisors, whose sum is σ = 213112112022. Its totient is φ = 213112112020.

The previous prime is 213112111999. The next prime is 213112112033. The reversal of 213112112021 is 120211211312.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212728500625 + 383611396 = 461225^2 + 19586^2 .

It is a cyclic number.

It is not a de Polignac number, because 213112112021 - 2³⁴ = 195932242837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213112112071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106556056010 + 106556056011.

It is an arithmetic number, because the mean of its divisors is an integer number (106556056011).

Almost surely, 2^213112112021 is an apocalyptic number.

It is an amenable number.

213112112021 is a deficient number, since it is larger than the sum of its proper divisors (1).

213112112021 is an equidigital number, since it uses as much as digits as its factorization.

213112112021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 213112112021 its reverse (120211211312), we get a palindrome (333323323333).

The spelling of 213112112021 in words is "two hundred thirteen billion, one hundred twelve million, one hundred twelve thousand, twenty-one".