212521345357 has 4 divisors (see below), whose sum is σ = 212902892316. Its totient is φ = 212139798400.

The previous prime is 212521345349. The next prime is 212521345369. The reversal of 212521345357 is 753543125212.

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 101921201001 + 110600144356 = 319251^2 + 332566^2 .

It is a cyclic number.

It is not a de Polignac number, because 212521345357 - 2³ = 212521345349 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 (212521345307) 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, 190772644 + ... + 190773757.

It is an arithmetic number, because the mean of its divisors is an integer number (53225723079).

Almost surely, 2^212521345357 is an apocalyptic number.

It is an amenable number.

212521345357 is a deficient number, since it is larger than the sum of its proper divisors (381546959).

212521345357 is an equidigital number, since it uses as much as digits as its factorization.

212521345357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381546958.

The product of its digits is 252000, while the sum is 40.

The spelling of 212521345357 in words is "two hundred twelve billion, five hundred twenty-one million, three hundred forty-five thousand, three hundred fifty-seven".