212337221 has 2 divisors, whose sum is σ = 212337222. Its totient is φ = 212337220.

The previous prime is 212337193. The next prime is 212337233. The reversal of 212337221 is 122733212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191961025 + 20376196 = 13855^2 + 4514^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212337221 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212337241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106168610 + 106168611.

It is an arithmetic number, because the mean of its divisors is an integer number (106168611).

Almost surely, 2^212337221 is an apocalyptic number.

It is an amenable number.

212337221 is a deficient number, since it is larger than the sum of its proper divisors (1).

212337221 is an equidigital number, since it uses as much as digits as its factorization.

212337221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 23.

The square root of 212337221 is about 14571.7953938422. The cubic root of 212337221 is about 596.5891852755.

The spelling of 212337221 in words is "two hundred twelve million, three hundred thirty-seven thousand, two hundred twenty-one".