22221257672 has 8 divisors (see below), whose sum is σ = 41664858150. Its totient is φ = 11110628832.

The previous prime is 22221257671. The next prime is 22221257677. The reversal of 22221257672 is 27675212222.

It can be written as a sum of positive squares in only one way, i.e., 17026596196 + 5194661476 = 130486^2 + 72074^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×22221257672³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (22221257671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1388828597 + ... + 1388828612.

Almost surely, 2^22221257672 is an apocalyptic number.

It is an amenable number.

22221257672 is a deficient number, since it is larger than the sum of its proper divisors (19443600478).

22221257672 is a wasteful number, since it uses less digits than its factorization.

22221257672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2777657215 (or 2777657211 counting only the distinct ones).

The product of its digits is 94080, while the sum is 38.

Adding to 22221257672 its reverse (27675212222), we get a palindrome (49896469894).

The spelling of 22221257672 in words is "twenty-two billion, two hundred twenty-one million, two hundred fifty-seven thousand, six hundred seventy-two".