212397755 has 16 divisors (see below), whose sum is σ = 266471424. Its totient is φ = 162217440.

The previous prime is 212397743. The next prime is 212397799. The reversal of 212397755 is 557793212.

It is not a de Polignac number, because 212397755 - 2⁸ = 212397499 is a prime.

It is a super-2 number, since 2×212397755² = 90225612658080050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71102 + ... + 74028.

It is an arithmetic number, because the mean of its divisors is an integer number (16654464).

Almost surely, 2^212397755 is an apocalyptic number.

212397755 is a deficient number, since it is larger than the sum of its proper divisors (54073669).

212397755 is a wasteful number, since it uses less digits than its factorization.

212397755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3586.

The product of its digits is 132300, while the sum is 41.

The square root of 212397755 is about 14573.8723405964. The cubic root of 212397755 is about 596.6458726182.

The spelling of 212397755 in words is "two hundred twelve million, three hundred ninety-seven thousand, seven hundred fifty-five".