22138765240 has 16 divisors (see below), whose sum is σ = 49812221880. Its totient is φ = 8855506080.

The previous prime is 22138765223. The next prime is 22138765241. The reversal of 22138765240 is 4256783122.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 553469131 = 22138765240 / (2 + 2 + 1 + 3 + 8 + 7 + 6 + 5 + 2 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 22138765193 and 22138765202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22138765241) 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, 276734526 + ... + 276734605.

Almost surely, 2^22138765240 is an apocalyptic number.

22138765240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22138765240 is an abundant number, since it is smaller than the sum of its proper divisors (27673456640).

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

22138765240 is a wasteful number, since it uses less digits than its factorization.

22138765240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553469142 (or 553469138 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 40.

The spelling of 22138765240 in words is "twenty-two billion, one hundred thirty-eight million, seven hundred sixty-five thousand, two hundred forty".