212390057 has 4 divisors (see below), whose sum is σ = 231698256. Its totient is φ = 193081860.

The previous prime is 212390047. The next prime is 212390063. The reversal of 212390057 is 750093212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212390057 - 2⁴ = 212390041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212390047) 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, 9654083 + ... + 9654104.

It is an arithmetic number, because the mean of its divisors is an integer number (57924564).

Almost surely, 2^212390057 is an apocalyptic number.

It is an amenable number.

212390057 is a deficient number, since it is larger than the sum of its proper divisors (19308199).

212390057 is a wasteful number, since it uses less digits than its factorization.

212390057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19308198.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 212390057 is about 14573.6082354371. The cubic root of 212390057 is about 596.6386643885.

The spelling of 212390057 in words is "two hundred twelve million, three hundred ninety thousand, fifty-seven".