222312021 has 32 divisors (see below), whose sum is σ = 318455808. Its totient is φ = 137712960.

The previous prime is 222312011. The next prime is 222312029. The reversal of 222312021 is 120213222.

It is a happy number.

It is not a de Polignac number, because 222312021 - 2⁷ = 222311893 is a prime.

It is a super-2 number, since 2×222312021² = 98845269362208882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222312029) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 223836 + ... + 224826.

It is an arithmetic number, because the mean of its divisors is an integer number (9951744).

Almost surely, 2^222312021 is an apocalyptic number.

It is an amenable number.

222312021 is a deficient number, since it is larger than the sum of its proper divisors (96143787).

222312021 is a wasteful number, since it uses less digits than its factorization.

222312021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 222312021 is about 14910.1314883538. The cubic root of 222312021 is about 605.7884408943.

Adding to 222312021 its reverse (120213222), we get a palindrome (342525243).

The spelling of 222312021 in words is "two hundred twenty-two million, three hundred twelve thousand, twenty-one".