6940210221 has 32 divisors (see below), whose sum is σ = 11757649920. Its totient is φ = 3963462192.

The previous prime is 6940210171. The next prime is 6940210231. The reversal of 6940210221 is 1220120496.

It is not a de Polignac number, because 6940210221 - 2¹⁰ = 6940209197 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6940210231) 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, 334476 + ... + 354618.

It is an arithmetic number, because the mean of its divisors is an integer number (367426560).

Almost surely, 2^6940210221 is an apocalyptic number.

It is an amenable number.

6940210221 is a deficient number, since it is larger than the sum of its proper divisors (4817439699).

6940210221 is a wasteful number, since it uses less digits than its factorization.

6940210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21982 (or 21976 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 6940210221 is about 83307.9241188976. The cubic root of 6940210221 is about 1907.4692340159.

The spelling of 6940210221 in words is "six billion, nine hundred forty million, two hundred ten thousand, two hundred twenty-one".