212424311921 has 2 divisors, whose sum is σ = 212424311922. Its totient is φ = 212424311920.

The previous prime is 212424311873. The next prime is 212424311959. The reversal of 212424311921 is 129113424212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119467009600 + 92957302321 = 345640^2 + 304889^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212424311921 is a prime.

It is a super-2 number, since 2×212424311921² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (212424310921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106212155960 + 106212155961.

It is an arithmetic number, because the mean of its divisors is an integer number (106212155961).

Almost surely, 2^212424311921 is an apocalyptic number.

It is an amenable number.

212424311921 is a deficient number, since it is larger than the sum of its proper divisors (1).

212424311921 is an equidigital number, since it uses as much as digits as its factorization.

212424311921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 32.

The spelling of 212424311921 in words is "two hundred twelve billion, four hundred twenty-four million, three hundred eleven thousand, nine hundred twenty-one".