212622661 has 2 divisors, whose sum is σ = 212622662. Its totient is φ = 212622660.

The previous prime is 212622653. The next prime is 212622671. The reversal of 212622661 is 166226212.

212622661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194184225 + 18438436 = 13935^2 + 4294^2 .

It is a cyclic number.

It is not a de Polignac number, because 212622661 - 2³ = 212622653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212622611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106311330 + 106311331.

It is an arithmetic number, because the mean of its divisors is an integer number (106311331).

Almost surely, 2^212622661 is an apocalyptic number.

It is an amenable number.

212622661 is a deficient number, since it is larger than the sum of its proper divisors (1).

212622661 is an equidigital number, since it uses as much as digits as its factorization.

212622661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 28.

The square root of 212622661 is about 14581.5863677448. The cubic root of 212622661 is about 596.8563925780.

Adding to 212622661 its reverse (166226212), we get a palindrome (378848873).

The spelling of 212622661 in words is "two hundred twelve million, six hundred twenty-two thousand, six hundred sixty-one".