6900640221 has 16 divisors (see below), whose sum is σ = 9836671104. Its totient is φ = 4287773184.

The previous prime is 6900640163. The next prime is 6900640231. The reversal of 6900640221 is 1220460096.

It is not a de Polignac number, because 6900640221 - 2¹³ = 6900632029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6900640231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 651576 + ... + 662081.

It is an arithmetic number, because the mean of its divisors is an integer number (614791944).

Almost surely, 2^6900640221 is an apocalyptic number.

It is an amenable number.

6900640221 is a deficient number, since it is larger than the sum of its proper divisors (2936030883).

6900640221 is a wasteful number, since it uses less digits than its factorization.

6900640221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1313780.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 6900640221 is about 83070.0922173558. The cubic root of 6900640221 is about 1903.8371412448.

The spelling of 6900640221 in words is "six billion, nine hundred million, six hundred forty thousand, two hundred twenty-one".