212568921 has 32 divisors (see below), whose sum is σ = 335646720. Its totient is φ = 132648912.

The previous prime is 212568899. The next prime is 212568973. The reversal of 212568921 is 129865212.

212568921 is a `hidden beast` number, since 2 + 1 + 2 + 568 + 92 + 1 = 666.

It is not a de Polignac number, because 212568921 - 2¹³ = 212560729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212567921) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25546 + ... + 32828.

It is an arithmetic number, because the mean of its divisors is an integer number (10488960).

Almost surely, 2^212568921 is an apocalyptic number.

It is an amenable number.

212568921 is a deficient number, since it is larger than the sum of its proper divisors (123077799).

212568921 is a wasteful number, since it uses less digits than its factorization.

212568921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7362 (or 7356 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 212568921 is about 14579.7435162626. The cubic root of 212568921 is about 596.8061035432.

The spelling of 212568921 in words is "two hundred twelve million, five hundred sixty-eight thousand, nine hundred twenty-one".