6867428921 has 4 divisors (see below), whose sum is σ = 6964153344. Its totient is φ = 6770704500.

The previous prime is 6867428917. The next prime is 6867428927. The reversal of 6867428921 is 1298247686.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6867428921 - 2² = 6867428917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6867428927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48362105 + ... + 48362246.

It is an arithmetic number, because the mean of its divisors is an integer number (1741038336).

Almost surely, 2^6867428921 is an apocalyptic number.

It is an amenable number.

6867428921 is a deficient number, since it is larger than the sum of its proper divisors (96724423).

6867428921 is an equidigital number, since it uses as much as digits as its factorization.

6867428921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96724422.

The product of its digits is 2322432, while the sum is 53.

The square root of 6867428921 is about 82869.9518583183. The cubic root of 6867428921 is about 1900.7779751275. Note that the first 3 decimals are identical.

The spelling of 6867428921 in words is "six billion, eight hundred sixty-seven million, four hundred twenty-eight thousand, nine hundred twenty-one".