212839921 has 8 divisors (see below), whose sum is σ = 245608064. Its totient is φ = 180662400.

The previous prime is 212839889. The next prime is 212839927. The reversal of 212839921 is 129938212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212839921 - 2⁵ = 212839889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212839927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146880 + ... + 148321.

It is an arithmetic number, because the mean of its divisors is an integer number (30701008).

Almost surely, 2^212839921 is an apocalyptic number.

It is an amenable number.

212839921 is a deficient number, since it is larger than the sum of its proper divisors (32768143).

212839921 is a wasteful number, since it uses less digits than its factorization.

212839921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295311.

The product of its digits is 15552, while the sum is 37.

The square root of 212839921 is about 14589.0342723568. The cubic root of 212839921 is about 597.0596146887.

The spelling of 212839921 in words is "two hundred twelve million, eight hundred thirty-nine thousand, nine hundred twenty-one".