212658253521 has 16 divisors (see below), whose sum is σ = 341105971200. Its totient is φ = 115123264848.

The previous prime is 212658253471. The next prime is 212658253523. The reversal of 212658253521 is 125352856212.

It is not a de Polignac number, because 212658253521 - 2¹⁹ = 212657729233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212658253523) 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, 266488641 + ... + 266489438.

It is an arithmetic number, because the mean of its divisors is an integer number (21319123200).

Almost surely, 2^212658253521 is an apocalyptic number.

212658253521 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

212658253521 is a deficient number, since it is larger than the sum of its proper divisors (128447717679).

212658253521 is a wasteful number, since it uses less digits than its factorization.

212658253521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532978108.

The product of its digits is 288000, while the sum is 42.

The spelling of 212658253521 in words is "two hundred twelve billion, six hundred fifty-eight million, two hundred fifty-three thousand, five hundred twenty-one".