212391361 has 16 divisors (see below), whose sum is σ = 272772864. Its totient is φ = 160737984.

The previous prime is 212391349. The next prime is 212391391. The reversal of 212391361 is 163193212.

It is not a de Polignac number, because 212391361 - 2¹³ = 212383169 is a prime.

It is a super-2 number, since 2×212391361² = 90220180454864642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212391301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48646 + ... + 52831.

It is an arithmetic number, because the mean of its divisors is an integer number (17048304).

Almost surely, 2^212391361 is an apocalyptic number.

It is an amenable number.

212391361 is a deficient number, since it is larger than the sum of its proper divisors (60381503).

212391361 is a wasteful number, since it uses less digits than its factorization.

212391361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101520.

The product of its digits is 1944, while the sum is 28.

The square root of 212391361 is about 14573.6529737743. The cubic root of 212391361 is about 596.6398854362.

The spelling of 212391361 in words is "two hundred twelve million, three hundred ninety-one thousand, three hundred sixty-one".