21395970352 has 40 divisors (see below), whose sum is σ = 42980677632. Its totient is φ = 10307227200.

The previous prime is 21395970341. The next prime is 21395970373. The reversal of 21395970352 is 25307959312.

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, 17577 + ... + 207607.

Almost surely, 2^21395970352 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 21395970352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21490338816).

21395970352 is an abundant number, since it is smaller than the sum of its proper divisors (21584707280).

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

21395970352 is a wasteful number, since it uses less digits than its factorization.

21395970352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190297 (or 190291 counting only the distinct ones).

The product of its (nonzero) digits is 510300, while the sum is 46.

The spelling of 21395970352 in words is "twenty-one billion, three hundred ninety-five million, nine hundred seventy thousand, three hundred fifty-two".