212653521 has 24 divisors (see below), whose sum is σ = 323841024. Its totient is φ = 134268480.

The previous prime is 212653513. The next prime is 212653531. The reversal of 212653521 is 125356212.

It is a happy number.

212653521 is a `hidden beast` number, since 2 + 1 + 2 + 653 + 5 + 2 + 1 = 666.

It is not a de Polignac number, because 212653521 - 2³ = 212653513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212653501) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5005 + ... + 21221.

It is an arithmetic number, because the mean of its divisors is an integer number (13493376).

Almost surely, 2^212653521 is an apocalyptic number.

It is an amenable number.

212653521 is a deficient number, since it is larger than the sum of its proper divisors (111187503).

212653521 is a wasteful number, since it uses less digits than its factorization.

212653521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16301 (or 16298 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 212653521 is about 14582.6445132562. The cubic root of 212653521 is about 596.8852670438.

The spelling of 212653521 in words is "two hundred twelve million, six hundred fifty-three thousand, five hundred twenty-one".