6821072905 has 8 divisors (see below), whose sum is σ = 8288899200. Its totient is φ = 5387783856.

The previous prime is 6821072897. The next prime is 6821072989. The reversal of 6821072905 is 5092701286.

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 6821072905 - 2³ = 6821072897 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8633875 + ... + 8634664.

It is an arithmetic number, because the mean of its divisors is an integer number (1036112400).

Almost surely, 2^6821072905 is an apocalyptic number.

It is an amenable number.

6821072905 is a deficient number, since it is larger than the sum of its proper divisors (1467826295).

6821072905 is a wasteful number, since it uses less digits than its factorization.

6821072905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17268623.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 6821072905 is about 82589.7869291355. The cubic root of 6821072905 is about 1896.4914850442.

The spelling of 6821072905 in words is "six billion, eight hundred twenty-one million, seventy-two thousand, nine hundred five".