6610002021 has 24 divisors (see below), whose sum is σ = 10914658560. Its totient is φ = 3776137056.

The previous prime is 6610001989. The next prime is 6610002041. The reversal of 6610002021 is 1202000166.

It is a happy number.

6610002021 is a `hidden beast` number, since 661 + 0 + 0 + 0 + 2 + 0 + 2 + 1 = 666.

It is not a de Polignac number, because 6610002021 - 2⁵ = 6610001989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6610001985 and 6610002003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6610002041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 269415 + ... + 292923.

It is an arithmetic number, because the mean of its divisors is an integer number (454777440).

Almost surely, 2^6610002021 is an apocalyptic number.

It is an amenable number.

6610002021 is a deficient number, since it is larger than the sum of its proper divisors (4304656539).

6610002021 is a wasteful number, since it uses less digits than its factorization.

6610002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27985 (or 27982 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 6610002021 is about 81301.9189256933. The cubic root of 6610002021 is about 1876.7245309234.

Adding to 6610002021 its reverse (1202000166), we get a palindrome (7812002187).

The spelling of 6610002021 in words is "six billion, six hundred ten million, two thousand, twenty-one".