6670542021 has 32 divisors (see below), whose sum is σ = 10998919680. Its totient is φ = 3535358400.

The previous prime is 6670542017. The next prime is 6670542037. The reversal of 6670542021 is 1202450766.

It is not a de Polignac number, because 6670542021 - 2² = 6670542017 is a prime.

It is a super-2 number, since 2×6670542021² = 88992261707853528882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6670542721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 401035 + ... + 417336.

It is an arithmetic number, because the mean of its divisors is an integer number (343716240).

Almost surely, 2^6670542021 is an apocalyptic number.

It is an amenable number.

6670542021 is a deficient number, since it is larger than the sum of its proper divisors (4328377659).

6670542021 is a wasteful number, since it uses less digits than its factorization.

6670542021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818417.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 6670542021 is about 81673.3862466838. The cubic root of 6670542021 is about 1882.4366719260.

Adding to 6670542021 its reverse (1202450766), we get a palindrome (7872992787).

The spelling of 6670542021 in words is "six billion, six hundred seventy million, five hundred forty-two thousand, twenty-one".