212264621 has 4 divisors (see below), whose sum is σ = 212521500. Its totient is φ = 212007744.

The previous prime is 212264617. The next prime is 212264623. The reversal of 212264621 is 126462212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 177289225 + 34975396 = 13315^2 + 5914^2 .

It is a cyclic number.

It is not a de Polignac number, because 212264621 - 2² = 212264617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212264623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127196 + ... + 128853.

It is an arithmetic number, because the mean of its divisors is an integer number (53130375).

Almost surely, 2^212264621 is an apocalyptic number.

It is an amenable number.

212264621 is a deficient number, since it is larger than the sum of its proper divisors (256879).

212264621 is an equidigital number, since it uses as much as digits as its factorization.

212264621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256878.

The product of its digits is 2304, while the sum is 26.

The square root of 212264621 is about 14569.3040671132. The cubic root of 212264621 is about 596.5211844607.

The spelling of 212264621 in words is "two hundred twelve million, two hundred sixty-four thousand, six hundred twenty-one".