22131212440 has 16 divisors (see below), whose sum is σ = 49795228080. Its totient is φ = 8852484960.

The previous prime is 22131212431. The next prime is 22131212447. The reversal of 22131212440 is 4421213122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22131212447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 276640116 + ... + 276640195.

It is an arithmetic number, because the mean of its divisors is an integer number (3112201755).

Almost surely, 2^22131212440 is an apocalyptic number.

22131212440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22131212440 is an abundant number, since it is smaller than the sum of its proper divisors (27664015640).

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

22131212440 is a wasteful number, since it uses less digits than its factorization.

22131212440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553280322 (or 553280318 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 22131212440 its reverse (4421213122), we get a palindrome (26552425562).

The spelling of 22131212440 in words is "twenty-two billion, one hundred thirty-one million, two hundred twelve thousand, four hundred forty".