6869846021 has 2 divisors, whose sum is σ = 6869846022. Its totient is φ = 6869846020.

The previous prime is 6869845963. The next prime is 6869846029. The reversal of 6869846021 is 1206489686.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5878288900 + 991557121 = 76670^2 + 31489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6869846021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6869846029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3434923010 + 3434923011.

It is an arithmetic number, because the mean of its divisors is an integer number (3434923011).

Almost surely, 2^6869846021 is an apocalyptic number.

It is an amenable number.

6869846021 is a deficient number, since it is larger than the sum of its proper divisors (1).

6869846021 is an equidigital number, since it uses as much as digits as its factorization.

6869846021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 995328, while the sum is 50.

The square root of 6869846021 is about 82884.5342690661. The cubic root of 6869846021 is about 1901.0009519058. Note that the first 3 decimals are identical.

The spelling of 6869846021 in words is "six billion, eight hundred sixty-nine million, eight hundred forty-six thousand, twenty-one".