212992921 has 2 divisors, whose sum is σ = 212992922. Its totient is φ = 212992920.

The previous prime is 212992919. The next prime is 212992939. The reversal of 212992921 is 129299212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 203775625 + 9217296 = 14275^2 + 3036^2 .

It is a cyclic number.

It is not a de Polignac number, because 212992921 - 2¹ = 212992919 is a prime.

It is a super-3 number, since 3×212992921³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 212992919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (212992981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106496460 + 106496461.

It is an arithmetic number, because the mean of its divisors is an integer number (106496461).

Almost surely, 2^212992921 is an apocalyptic number.

It is an amenable number.

212992921 is a deficient number, since it is larger than the sum of its proper divisors (1).

212992921 is an equidigital number, since it uses as much as digits as its factorization.

212992921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 37.

The square root of 212992921 is about 14594.2769947675. The cubic root of 212992921 is about 597.2026458775.

The spelling of 212992921 in words is "two hundred twelve million, nine hundred ninety-two thousand, nine hundred twenty-one".