212313130021 has 2 divisors, whose sum is σ = 212313130022. Its totient is φ = 212313130020.

The previous prime is 212313129991. The next prime is 212313130109. The reversal of 212313130021 is 120031313212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 188260532100 + 24052597921 = 433890^2 + 155089^2 .

It is a cyclic number.

It is not a de Polignac number, because 212313130021 - 2¹³ = 212313121829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212313830021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106156565010 + 106156565011.

It is an arithmetic number, because the mean of its divisors is an integer number (106156565011).

Almost surely, 2^212313130021 is an apocalyptic number.

It is an amenable number.

212313130021 is a deficient number, since it is larger than the sum of its proper divisors (1).

212313130021 is an equidigital number, since it uses as much as digits as its factorization.

212313130021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 212313130021 its reverse (120031313212), we get a palindrome (332344443233).

The spelling of 212313130021 in words is "two hundred twelve billion, three hundred thirteen million, one hundred thirty thousand, twenty-one".