222221100021 has 16 divisors (see below), whose sum is σ = 313736237568. Its totient is φ = 139427366400.

The previous prime is 222221100001. The next prime is 222221100029. The reversal of 222221100021 is 120001122222.

It is not a de Polignac number, because 222221100021 - 2⁶ = 222221099957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222221100029) 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, 1515036 + ... + 1655226.

It is an arithmetic number, because the mean of its divisors is an integer number (19608514848).

Almost surely, 2^222221100021 is an apocalyptic number.

It is an amenable number.

222221100021 is a deficient number, since it is larger than the sum of its proper divisors (91515137547).

222221100021 is a wasteful number, since it uses less digits than its factorization.

222221100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171292.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 222221100021 its reverse (120001122222), we get a palindrome (342222222243).

The spelling of 222221100021 in words is "two hundred twenty-two billion, two hundred twenty-one million, one hundred thousand, twenty-one".