222021121 has 4 divisors (see below), whose sum is σ = 253738432. Its totient is φ = 190303812.

The previous prime is 222021113. The next prime is 222021131. The reversal of 222021121 is 121120222.

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 not a de Polignac number, because 222021121 - 2³ = 222021113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222021131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15858645 + ... + 15858658.

It is an arithmetic number, because the mean of its divisors is an integer number (63434608).

Almost surely, 2^222021121 is an apocalyptic number.

It is an amenable number.

222021121 is a deficient number, since it is larger than the sum of its proper divisors (31717311).

222021121 is an equidigital number, since it uses as much as digits as its factorization.

222021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31717310.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 222021121 is about 14900.3731832461. The cubic root of 222021121 is about 605.5240965480.

Adding to 222021121 its reverse (121120222), we get a palindrome (343141343).

The spelling of 222021121 in words is "two hundred twenty-two million, twenty-one thousand, one hundred twenty-one".