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22222222221 = 356239131713
BaseRepresentation
bin10100101100100011…
…000011001110001101
32010100201000212001110
4110230203003032031
5331002342102341
614113031202233
71414454525613
oct245443031615
963321025043
1022222222221
119473957511
124382216379
132131bba024
14110b4a96b3
158a0dc7216
hex52c8c338d

22222222221 has 8 divisors (see below), whose sum is σ = 29630381440. Its totient is φ = 14814438912.

The previous prime is 22222222189. The next prime is 22222222223. The reversal of 22222222221 is 12222222222.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22222222221 - 25 = 22222222189 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22222222223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102861 + ... + 234573.

It is an arithmetic number, because the mean of its divisors is an integer number (3703797680).

Almost surely, 222222222221 is an apocalyptic number.

It is an amenable number.

22222222221 is a deficient number, since it is larger than the sum of its proper divisors (7408159219).

22222222221 is a wasteful number, since it uses less digits than its factorization.

22222222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187955.

The product of its digits is 1024, while the sum is 21.

Adding to 22222222221 its reverse (12222222222), we get a palindrome (34444444443).

Subtracting from 22222222221 its reverse (12222222222), we obtain a palindrome (9999999999).

The spelling of 22222222221 in words is "twenty-two billion, two hundred twenty-two million, two hundred twenty-two thousand, two hundred twenty-one".

Divisors: 1 3 56239 131713 168717 395139 7407407407 22222222221