222110021 has 4 divisors (see below), whose sum is σ = 253840032. Its totient is φ = 190380012.

The previous prime is 222109991. The next prime is 222110027. The reversal of 222110021 is 120011222.

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 222110021 - 2¹⁴ = 222093637 is a prime.

It is a super-2 number, since 2×222110021² = 98665722857240882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 222109984 and 222110011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222110027) 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, 15864995 + ... + 15865008.

It is an arithmetic number, because the mean of its divisors is an integer number (63460008).

Almost surely, 2^222110021 is an apocalyptic number.

It is an amenable number.

222110021 is a deficient number, since it is larger than the sum of its proper divisors (31730011).

222110021 is an equidigital number, since it uses as much as digits as its factorization.

222110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31730010.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 222110021 is about 14903.3560314447. The cubic root of 222110021 is about 605.6049055399.

Adding to 222110021 its reverse (120011222), we get a palindrome (342121243).

The spelling of 222110021 in words is "two hundred twenty-two million, one hundred ten thousand, twenty-one".