22121031004440 has 128 divisors (see below), whose sum is σ = 67618250677440. Its totient is φ = 5787381989376.

The previous prime is 22121031004417. The next prime is 22121031004441. The reversal of 22121031004440 is 4440013012122.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 22121031004440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121031004441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 172120044 + ... + 172248516.

Almost surely, 2^{22121031004440} is an apocalyptic number.

22121031004440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22121031004440 is an abundant number, since it is smaller than the sum of its proper divisors (45497219673000).

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

22121031004440 is a wasteful number, since it uses less digits than its factorization.

22121031004440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155613 (or 155609 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 22121031004440 its reverse (4440013012122), we get a palindrome (26561044016562).

The spelling of 22121031004440 in words is "twenty-two trillion, one hundred twenty-one billion, thirty-one million, four thousand, four hundred forty".