6990837021 has 12 divisors (see below), whose sum is σ = 11540429472. Its totient is φ = 3994763976.

The previous prime is 6990837013. The next prime is 6990837037. The reversal of 6990837021 is 1207380996.

It is not a de Polignac number, because 6990837021 - 2³ = 6990837013 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6990837041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55482771 + ... + 55482896.

It is an arithmetic number, because the mean of its divisors is an integer number (961702456).

Almost surely, 2^6990837021 is an apocalyptic number.

It is an amenable number.

6990837021 is a deficient number, since it is larger than the sum of its proper divisors (4549592451).

6990837021 is a wasteful number, since it uses less digits than its factorization.

6990837021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110965680 (or 110965677 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 6990837021 is about 83611.2254485006. The cubic root of 6990837021 is about 1912.0961445857.

It can be divided in two parts, 69908 and 37021, that added together give a square (106929 = 327²).

The spelling of 6990837021 in words is "six billion, nine hundred ninety million, eight hundred thirty-seven thousand, twenty-one".