21996057852 has 72 divisors (see below), whose sum is σ = 59170967856. Its totient is φ = 6865657344.

The previous prime is 21996057821. The next prime is 21996057877. The reversal of 21996057852 is 25875069912.

21996057852 is a `hidden beast` number, since 2 + 1 + 9 + 9 + 60 + 578 + 5 + 2 = 666.

It is a super-2 number, since 2×21996057852² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29343 + ... + 211785.

It is an arithmetic number, because the mean of its divisors is an integer number (821818998).

Almost surely, 2^21996057852 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 21996057852, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29585483928).

21996057852 is an abundant number, since it is smaller than the sum of its proper divisors (37174910004).

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

21996057852 is a wasteful number, since it uses less digits than its factorization.

21996057852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182667 (or 182662 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 54.

The spelling of 21996057852 in words is "twenty-one billion, nine hundred ninety-six million, fifty-seven thousand, eight hundred fifty-two".