21281625092 has 48 divisors (see below), whose sum is σ = 45947072640. Its totient is φ = 8398950912.

The previous prime is 21281625067. The next prime is 21281625137. The reversal of 21281625092 is 29052618212.

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 15 ways as a sum of consecutive naturals, for example, 82748 + ... + 222284.

It is an arithmetic number, because the mean of its divisors is an integer number (957230680).

Almost surely, 2^21281625092 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21281625092, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22973536320).

21281625092 is an abundant number, since it is smaller than the sum of its proper divisors (24665447548).

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

21281625092 is a wasteful number, since it uses less digits than its factorization.

21281625092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139980 (or 139978 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 38.

The spelling of 21281625092 in words is "twenty-one billion, two hundred eighty-one million, six hundred twenty-five thousand, ninety-two".