21325101984 has 120 divisors (see below), whose sum is σ = 62781808320. Its totient is φ = 7100970624.

The previous prime is 21325101961. The next prime is 21325101997. The reversal of 21325101984 is 48910152312.

21325101984 is a `hidden beast` number, since 2 + 132 + 510 + 1 + 9 + 8 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2855247 + ... + 2862705.

It is an arithmetic number, because the mean of its divisors is an integer number (523181736).

Almost surely, 2^21325101984 is an apocalyptic number.

21325101984 is a gapful number since it is divisible by the number (24) 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 21325101984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31390904160).

21325101984 is an abundant number, since it is smaller than the sum of its proper divisors (41456706336).

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

21325101984 is a wasteful number, since it uses less digits than its factorization.

21325101984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8584 (or 8567 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The spelling of 21325101984 in words is "twenty-one billion, three hundred twenty-five million, one hundred one thousand, nine hundred eighty-four".