222311021 has 4 divisors (see below), whose sum is σ = 222468672. Its totient is φ = 222153372.

The previous prime is 222311009. The next prime is 222311029. The reversal of 222311021 is 120113222.

It is a happy number.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222311021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222310987 and 222311005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222311029) 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, 76691 + ... + 79536.

It is an arithmetic number, because the mean of its divisors is an integer number (55617168).

Almost surely, 2^222311021 is an apocalyptic number.

It is an amenable number.

222311021 is a deficient number, since it is larger than the sum of its proper divisors (157651).

222311021 is a wasteful number, since it uses less digits than its factorization.

222311021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157650.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 222311021 is about 14910.0979540713. The cubic root of 222311021 is about 605.7875325773.

Adding to 222311021 its reverse (120113222), we get a palindrome (342424243).

The spelling of 222311021 in words is "two hundred twenty-two million, three hundred eleven thousand, twenty-one".