222120021 has 16 divisors (see below), whose sum is σ = 301166208. Its totient is φ = 145588800.

The previous prime is 222119987. The next prime is 222120023. The reversal of 222120021 is 120021222.

222120021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 222120021 - 2⁷ = 222119893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 222119979 and 222120006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222120023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88435 + ... + 90911.

It is an arithmetic number, because the mean of its divisors is an integer number (18822888).

Almost surely, 2^222120021 is an apocalyptic number.

It is an amenable number.

222120021 is a deficient number, since it is larger than the sum of its proper divisors (79046187).

222120021 is a wasteful number, since it uses less digits than its factorization.

222120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2972.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 222120021 is about 14903.6915225725. The cubic root of 222120021 is about 605.6139940660.

Adding to 222120021 its reverse (120021222), we get a palindrome (342141243).

It can be divided in two parts, 222 and 120021, that multiplied together give a palindrome (26644662).

The spelling of 222120021 in words is "two hundred twenty-two million, one hundred twenty thousand, twenty-one".