22221257640 has 64 divisors (see below), whose sum is σ = 66753763200. Its totient is φ = 5917669632.

The previous prime is 22221257629. The next prime is 22221257659. The reversal of 22221257640 is 4675212222.

It is a super-2 number, since 2×22221257640² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35455 + ... + 213774.

It is an arithmetic number, because the mean of its divisors is an integer number (1043027550).

Almost surely, 2^22221257640 is an apocalyptic number.

22221257640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22221257640 is an abundant number, since it is smaller than the sum of its proper divisors (44532505560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22221257640 is a wasteful number, since it uses less digits than its factorization.

22221257640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249986 (or 249982 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 33.

Adding to 22221257640 its reverse (4675212222), we get a palindrome (26896469862).

The spelling of 22221257640 in words is "twenty-two billion, two hundred twenty-one million, two hundred fifty-seven thousand, six hundred forty".