21122370752 has 28 divisors (see below), whose sum is σ = 47902520400. Its totient is φ = 9052444416.

The previous prime is 21122370743. The next prime is 21122370803. The reversal of 21122370752 is 25707322112.

It is a tau number, because it is divible by the number of its divisors (28).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

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, 23573627 + ... + 23574522.

It is an arithmetic number, because the mean of its divisors is an integer number (1710804300).

Almost surely, 2^21122370752 is an apocalyptic number.

It is an amenable number.

21122370752 is an abundant number, since it is smaller than the sum of its proper divisors (26780149648).

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

21122370752 is an equidigital number, since it uses as much as digits as its factorization.

21122370752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47148168 (or 47148158 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 32.

Adding to 21122370752 its reverse (25707322112), we get a palindrome (46829692864).

The spelling of 21122370752 in words is "twenty-one billion, one hundred twenty-two million, three hundred seventy thousand, seven hundred fifty-two".