212563621 has 16 divisors (see below), whose sum is σ = 231907840. Its totient is φ = 194088960.

The previous prime is 212563579. The next prime is 212563627. The reversal of 212563621 is 126365212.

It is a cyclic number.

It is not a de Polignac number, because 212563621 - 2¹⁵ = 212530853 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212563621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212563627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 183781 + ... + 184933.

It is an arithmetic number, because the mean of its divisors is an integer number (14494240).

Almost surely, 2^212563621 is an apocalyptic number.

It is an amenable number.

212563621 is a deficient number, since it is larger than the sum of its proper divisors (19344219).

212563621 is a wasteful number, since it uses less digits than its factorization.

212563621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1516.

The product of its digits is 4320, while the sum is 28.

The square root of 212563621 is about 14579.5617561023. The cubic root of 212563621 is about 596.8011434285.

The spelling of 212563621 in words is "two hundred twelve million, five hundred sixty-three thousand, six hundred twenty-one".