21032769072 has 160 divisors (see below), whose sum is σ = 63043107840. Its totient is φ = 5918330880.

The previous prime is 21032769067. The next prime is 21032769089. The reversal of 21032769072 is 27096723012.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 21032769072.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8401773 + ... + 8404275.

It is an arithmetic number, because the mean of its divisors is an integer number (394019424).

Almost surely, 2^21032769072 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 21032769072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31521553920).

21032769072 is an abundant number, since it is smaller than the sum of its proper divisors (42010338768).

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

21032769072 is a wasteful number, since it uses less digits than its factorization.

21032769072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2891 (or 2885 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 39.

The spelling of 21032769072 in words is "twenty-one billion, thirty-two million, seven hundred sixty-nine thousand, seventy-two".