10821321720 has 192 divisors, whose sum is σ = 38537272800. Its totient is φ = 2611676160.

The previous prime is 10821321703. The next prime is 10821321743. The reversal of 10821321720 is 2712312801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 900874 + ... + 912806.

Almost surely, 2^10821321720 is an apocalyptic number.

10821321720 is a gapful number since it is divisible by the number (10) 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 10821321720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19268636400).

10821321720 is an abundant number, since it is smaller than the sum of its proper divisors (27715951080).

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

10821321720 is a wasteful number, since it uses less digits than its factorization.

10821321720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12190 (or 12183 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The spelling of 10821321720 in words is "ten billion, eight hundred twenty-one million, three hundred twenty-one thousand, seven hundred twenty".