21552303445 has 32 divisors (see below), whose sum is σ = 26919383040. Its totient is φ = 16547328000.

The previous prime is 21552303413. The next prime is 21552303449. The reversal of 21552303445 is 54430325512.

It is not a de Polignac number, because 21552303445 - 2⁵ = 21552303413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21552303445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21552303449) 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, 10122141 + ... + 10124269.

It is an arithmetic number, because the mean of its divisors is an integer number (841230720).

Almost surely, 2^21552303445 is an apocalyptic number.

It is an amenable number.

21552303445 is a deficient number, since it is larger than the sum of its proper divisors (5367079595).

21552303445 is a wasteful number, since it uses less digits than its factorization.

21552303445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2677.

The product of its (nonzero) digits is 72000, while the sum is 34.

Adding to 21552303445 its reverse (54430325512), we get a palindrome (75982628957).

The spelling of 21552303445 in words is "twenty-one billion, five hundred fifty-two million, three hundred three thousand, four hundred forty-five".