212121343 has 24 divisors (see below), whose sum is σ = 252806400. Its totient is φ = 177409008.

The previous prime is 212121319. The next prime is 212121379. The reversal of 212121343 is 343121212.

It is a happy number.

It is not a de Polignac number, because 212121343 - 2¹⁷ = 211990271 is a prime.

It is a super-2 number, since 2×212121343² = 89990928312247298, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 212121343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212121383) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 690796 + ... + 691102.

It is an arithmetic number, because the mean of its divisors is an integer number (10533600).

Almost surely, 2^212121343 is an apocalyptic number.

212121343 is a deficient number, since it is larger than the sum of its proper divisors (40685057).

212121343 is a wasteful number, since it uses less digits than its factorization.

212121343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619 (or 612 counting only the distinct ones).

The product of its digits is 288, while the sum is 19.

The square root of 212121343 is about 14564.3861181994. The cubic root of 212121343 is about 596.3869375643.

Adding to 212121343 its reverse (343121212), we get a palindrome (555242555).

The spelling of 212121343 in words is "two hundred twelve million, one hundred twenty-one thousand, three hundred forty-three".