212400343 has 4 divisors (see below), whose sum is σ = 214349080. Its totient is φ = 210451608.

The previous prime is 212400323. The next prime is 212400361. The reversal of 212400343 is 343004212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212400343 - 2⁵ = 212400311 is a prime.

It is a super-2 number, since 2×212400343² = 90227811413035298, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212400343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212400323) 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, 974205 + ... + 974422.

It is an arithmetic number, because the mean of its divisors is an integer number (53587270).

Almost surely, 2^212400343 is an apocalyptic number.

212400343 is a deficient number, since it is larger than the sum of its proper divisors (1948737).

212400343 is a wasteful number, since it uses less digits than its factorization.

212400343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1948736.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 212400343 is about 14573.9611293567. The cubic root of 212400343 is about 596.6482959226.

Adding to 212400343 its reverse (343004212), we get a palindrome (555404555).

The spelling of 212400343 in words is "two hundred twelve million, four hundred thousand, three hundred forty-three".