22221142540 has 36 divisors (see below), whose sum is σ = 47959744896. Its totient is φ = 8648217792.

The previous prime is 22221142511. The next prime is 22221142543. The reversal of 22221142540 is 4524112222.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (22221142543) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 378412 + ... + 433171.

It is an arithmetic number, because the mean of its divisors is an integer number (1332215136).

Almost surely, 2^22221142540 is an apocalyptic number.

22221142540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22221142540 is an abundant number, since it is smaller than the sum of its proper divisors (25738602356).

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

22221142540 is a wasteful number, since it uses less digits than its factorization.

22221142540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811666 (or 811627 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 25.

Adding to 22221142540 its reverse (4524112222), we get a palindrome (26745254762).

The spelling of 22221142540 in words is "twenty-two billion, two hundred twenty-one million, one hundred forty-two thousand, five hundred forty".