21225583992 has 32 divisors (see below), whose sum is σ = 53341793280. Its totient is φ = 7038150240.

The previous prime is 21225583979. The next prime is 21225584053. The reversal of 21225583992 is 29938552212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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, 2310598 + ... + 2319765.

It is an arithmetic number, because the mean of its divisors is an integer number (1666931040).

Almost surely, 2^21225583992 is an apocalyptic number.

It is an amenable number.

21225583992 is an abundant number, since it is smaller than the sum of its proper divisors (32116209288).

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

21225583992 is a wasteful number, since it uses less digits than its factorization.

21225583992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4630563 (or 4630559 counting only the distinct ones).

The product of its digits is 777600, while the sum is 48.

The spelling of 21225583992 in words is "twenty-one billion, two hundred twenty-five million, five hundred eighty-three thousand, nine hundred ninety-two".