392101221 has 4 divisors (see below), whose sum is σ = 522801632. Its totient is φ = 261400812.

The previous prime is 392101211. The next prime is 392101223. The reversal of 392101221 is 122101293.

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.

It is not a de Polignac number, because 392101221 - 2⁵ = 392101189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (392101223) 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, 65350201 + ... + 65350206.

It is an arithmetic number, because the mean of its divisors is an integer number (130700408).

Almost surely, 2^392101221 is an apocalyptic number.

It is an amenable number.

392101221 is a deficient number, since it is larger than the sum of its proper divisors (130700411).

392101221 is a wasteful number, since it uses less digits than its factorization.

392101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130700410.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 392101221 is about 19801.5459244979. The cubic root of 392101221 is about 731.9241295398.

The spelling of 392101221 in words is "three hundred ninety-two million, one hundred one thousand, two hundred twenty-one".