6920872921 has 8 divisors (see below), whose sum is σ = 6998558688. Its totient is φ = 6843564000.

The previous prime is 6920872897. The next prime is 6920872943. The reversal of 6920872921 is 1292780296.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6920872921 - 2²¹ = 6918775769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6920872961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57195 + ... + 130816.

It is an arithmetic number, because the mean of its divisors is an integer number (874819836).

Almost surely, 2^6920872921 is an apocalyptic number.

It is an amenable number.

6920872921 is a deficient number, since it is larger than the sum of its proper divisors (77685767).

6920872921 is a wasteful number, since it uses less digits than its factorization.

6920872921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188423.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 6920872921 is about 83191.7839753422. The cubic root of 6920872921 is about 1905.6960112919.

It can be divided in two parts, 69208 and 72921, that added together give a square (142129 = 377²).

The spelling of 6920872921 in words is "six billion, nine hundred twenty million, eight hundred seventy-two thousand, nine hundred twenty-one".