21425321632 has 96 divisors (see below), whose sum is σ = 49605514560. Its totient is φ = 8980561920.

The previous prime is 21425321591. The next prime is 21425321647. The reversal of 21425321632 is 23612352412.

It is a junction number, because it is equal to n+sod(n) for n = 21425321594 and 21425321603.

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, 6445923 + ... + 6449245.

It is an arithmetic number, because the mean of its divisors is an integer number (516724110).

Almost surely, 2^21425321632 is an apocalyptic number.

21425321632 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21425321632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24802757280).

21425321632 is an abundant number, since it is smaller than the sum of its proper divisors (28180192928).

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

21425321632 is a wasteful number, since it uses less digits than its factorization.

21425321632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4766 (or 4758 counting only the distinct ones).

The product of its digits is 17280, while the sum is 31.

The spelling of 21425321632 in words is "twenty-one billion, four hundred twenty-five million, three hundred twenty-one thousand, six hundred thirty-two".