212393811 has 16 divisors (see below), whose sum is σ = 324850688. Its totient is φ = 120916800.

The previous prime is 212393789. The next prime is 212393821. The reversal of 212393811 is 118393212.

It is not a de Polignac number, because 212393811 - 2⁷ = 212393683 is a prime.

It is a super-2 number, since 2×212393811² = 90222261902207442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212393821) 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, 12970 + ... + 24351.

It is an arithmetic number, because the mean of its divisors is an integer number (20303168).

Almost surely, 2^212393811 is an apocalyptic number.

212393811 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

212393811 is a deficient number, since it is larger than the sum of its proper divisors (112456877).

212393811 is a wasteful number, since it uses less digits than its factorization.

212393811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37602.

The product of its digits is 2592, while the sum is 30.

The square root of 212393811 is about 14573.7370293278. The cubic root of 212393811 is about 596.6421795693.

The spelling of 212393811 in words is "two hundred twelve million, three hundred ninety-three thousand, eight hundred eleven".