222222101022221 has 16 divisors (see below), whose sum is σ = 233998725434880. Its totient is φ = 210627557308080.

The previous prime is 222222101022211. The next prime is 222222101022239. The reversal of 222222101022221 is 122220101222222.

It is a de Polignac number, because none of the positive numbers 2^k-222222101022221 is a prime.

It is a super-2 number, since 2×222222101022221² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222222101022211) 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, 64780715 + ... + 68124776.

It is an arithmetic number, because the mean of its divisors is an integer number (14624920339680).

Almost surely, 2^{222222101022221} is an apocalyptic number.

It is an amenable number.

222222101022221 is a deficient number, since it is larger than the sum of its proper divisors (11776624412659).

222222101022221 is a wasteful number, since it uses less digits than its factorization.

222222101022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132906176.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 222222101022221 its reverse (122220101222222), we get a palindrome (344442202244443).

The spelling of 222222101022221 in words is "two hundred twenty-two trillion, two hundred twenty-two billion, one hundred one million, twenty-two thousand, two hundred twenty-one".