6890559021 has 12 divisors (see below), whose sum is σ = 9962067648. Its totient is φ = 4589534664.

The previous prime is 6890558959. The next prime is 6890559031. The reversal of 6890559021 is 1209550986.

6890559021 is a `hidden beast` number, since 6 + 8 + 90 + 559 + 0 + 2 + 1 = 666.

It is not a de Polignac number, because 6890559021 - 2⁷ = 6890558893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6890559031) 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, 337135 + ... + 356988.

It is an arithmetic number, because the mean of its divisors is an integer number (830172304).

Almost surely, 2^6890559021 is an apocalyptic number.

It is an amenable number.

6890559021 is a deficient number, since it is larger than the sum of its proper divisors (3071508627).

6890559021 is a wasteful number, since it uses less digits than its factorization.

6890559021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695232 (or 695229 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The square root of 6890559021 is about 83009.3911614824. The cubic root of 6890559021 is about 1902.9095791467.

The spelling of 6890559021 in words is "six billion, eight hundred ninety million, five hundred fifty-nine thousand, twenty-one".