21070356432 has 160 divisors (see below), whose sum is σ = 58715289600. Its totient is φ = 6490036224.

The previous prime is 21070356409. The next prime is 21070356443. The reversal of 21070356432 is 23465307012.

It is a junction number, because it is equal to n+sod(n) for n = 21070356393 and 21070356402.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16244808 + ... + 16246104.

It is an arithmetic number, because the mean of its divisors is an integer number (366970560).

Almost surely, 2^21070356432 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 21070356432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29357644800).

21070356432 is an abundant number, since it is smaller than the sum of its proper divisors (37644933168).

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

21070356432 is a wasteful number, since it uses less digits than its factorization.

21070356432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1753 (or 1747 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 33.

The spelling of 21070356432 in words is "twenty-one billion, seventy million, three hundred fifty-six thousand, four hundred thirty-two".