212856929 has 4 divisors (see below), whose sum is σ = 212886576. Its totient is φ = 212827284.

The previous prime is 212856911. The next prime is 212856961. The reversal of 212856929 is 929658212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 212856929 - 2⁸ = 212856673 is a prime.

It is a super-2 number, since 2×212856929² = 90616144446622082, 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 212856929.

It is not an unprimeable number, because it can be changed into a prime (212856629) 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, 3482 + ... + 20924.

It is an arithmetic number, because the mean of its divisors is an integer number (53221644).

Almost surely, 2^212856929 is an apocalyptic number.

It is an amenable number.

212856929 is a deficient number, since it is larger than the sum of its proper divisors (29647).

212856929 is a wasteful number, since it uses less digits than its factorization.

212856929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29646.

The product of its digits is 155520, while the sum is 44.

The square root of 212856929 is about 14589.6171642713. The cubic root of 212856929 is about 597.0755179074.

The spelling of 212856929 in words is "two hundred twelve million, eight hundred fifty-six thousand, nine hundred twenty-nine".