222121001 has 4 divisors (see below), whose sum is σ = 233811600. Its totient is φ = 210430404.

The previous prime is 222120991. The next prime is 222121007. The reversal of 222121001 is 100121222.

It is a happy number.

222121001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 222121001 - 2⁶ = 222120937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (222121007) 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, 5845271 + ... + 5845308.

It is an arithmetic number, because the mean of its divisors is an integer number (58452900).

Almost surely, 2^222121001 is an apocalyptic number.

It is an amenable number.

222121001 is a deficient number, since it is larger than the sum of its proper divisors (11690599).

222121001 is a wasteful number, since it uses less digits than its factorization.

222121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11690598.

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

The square root of 222121001 is about 14903.7244002967. The cubic root of 222121001 is about 605.6148847269.

Adding to 222121001 its reverse (100121222), we get a palindrome (322242223).

The spelling of 222121001 in words is "two hundred twenty-two million, one hundred twenty-one thousand, one".