6921342720 has 216 divisors, whose sum is σ = 24720888192. Its totient is φ = 1786060800.

The previous prime is 6921342697. The next prime is 6921342721. The reversal of 6921342720 is 272431296.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6921342721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 347430 + ... + 366810.

Almost surely, 2^6921342720 is an apocalyptic number.

6921342720 is a gapful number since it is divisible by the number (60) 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 6921342720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12360444096).

6921342720 is an abundant number, since it is smaller than the sum of its proper divisors (17799545472).

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

6921342720 is a wasteful number, since it uses less digits than its factorization.

6921342720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19439 (or 19422 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 6921342720 is about 83194.6075175549. The cubic root of 6921342720 is about 1905.7391307959.

The spelling of 6921342720 in words is "six billion, nine hundred twenty-one million, three hundred forty-two thousand, seven hundred twenty".