6948515021 has 24 divisors (see below), whose sum is σ = 8291208600. Its totient is φ = 5803953792.

The previous prime is 6948515017. The next prime is 6948515029. The reversal of 6948515021 is 1205158496.

It can be written as a sum of positive squares in 4 ways, for example, as 2708682025 + 4239832996 = 52045^2 + 65114^2 .

It is not a de Polignac number, because 6948515021 - 2² = 6948515017 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6948515021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6948515029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 377975 + ... + 395931.

It is an arithmetic number, because the mean of its divisors is an integer number (345467025).

Almost surely, 2^6948515021 is an apocalyptic number.

It is an amenable number.

6948515021 is a deficient number, since it is larger than the sum of its proper divisors (1342693579).

6948515021 is a wasteful number, since it uses less digits than its factorization.

6948515021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18173 (or 18166 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 41.

The square root of 6948515021 is about 83357.7532146830. The cubic root of 6948515021 is about 1908.2297698676.

The spelling of 6948515021 in words is "six billion, nine hundred forty-eight million, five hundred fifteen thousand, twenty-one".