222221002001021 has 4 divisors (see below), whose sum is σ = 229883795173500. Its totient is φ = 214558208828544.

The previous prime is 222221002000967. The next prime is 222221002001041. The reversal of 222221002001021 is 120100200122222.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 56790240964900 + 165430761036121 = 7535930^2 + 12861989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222221002001021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222221002001041) 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, 3831396586196 + ... + 3831396586253.

It is an arithmetic number, because the mean of its divisors is an integer number (57470948793375).

Almost surely, 2^{222221002001021} is an apocalyptic number.

It is an amenable number.

222221002001021 is a deficient number, since it is larger than the sum of its proper divisors (7662793172479).

222221002001021 is an equidigital number, since it uses as much as digits as its factorization.

222221002001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7662793172478.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 222221002001021 its reverse (120100200122222), we get a palindrome (342321202123243).

The spelling of 222221002001021 in words is "two hundred twenty-two trillion, two hundred twenty-one billion, two million, one thousand, twenty-one".