22521218638 has 8 divisors (see below), whose sum is σ = 33784371000. Its totient is φ = 11259761640.

The previous prime is 22521218633. The next prime is 22521218651. The reversal of 22521218638 is 83681212522.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 22521218638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22521218633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 390093 + ... + 444088.

It is an arithmetic number, because the mean of its divisors is an integer number (4223046375).

Almost surely, 2^22521218638 is an apocalyptic number.

22521218638 is a deficient number, since it is larger than the sum of its proper divisors (11263152362).

22521218638 is a wasteful number, since it uses less digits than its factorization.

22521218638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847682.

The product of its digits is 92160, while the sum is 40.

The spelling of 22521218638 in words is "twenty-two billion, five hundred twenty-one million, two hundred eighteen thousand, six hundred thirty-eight".