21552250422 has 16 divisors (see below), whose sum is σ = 43115898672. Its totient is φ = 7182183840.

The previous prime is 21552250417. The next prime is 21552250427. The reversal of 21552250422 is 22405225512.

It is an interprime number because it is at equal distance from previous prime (21552250417) and next prime (21552250427).

It is a self number, because there is not a number n which added to its sum of digits gives 21552250422.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21552250427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 450229 + ... + 495792.

It is an arithmetic number, because the mean of its divisors is an integer number (2694743667).

Almost surely, 2^21552250422 is an apocalyptic number.

21552250422 is an abundant number, since it is smaller than the sum of its proper divisors (21563648250).

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

21552250422 is a wasteful number, since it uses less digits than its factorization.

21552250422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949823.

The product of its (nonzero) digits is 16000, while the sum is 30.

Adding to 21552250422 its reverse (22405225512), we get a palindrome (43957475934).

The spelling of 21552250422 in words is "twenty-one billion, five hundred fifty-two million, two hundred fifty thousand, four hundred twenty-two".