7940210221 has 4 divisors (see below), whose sum is σ = 8109150912. Its totient is φ = 7771269532.

The previous prime is 7940210197. The next prime is 7940210227. The reversal of 7940210221 is 1220120497.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1220120497 = 27953 ⋅43649.

It is a cyclic number.

It is not a de Polignac number, because 7940210221 - 2²¹ = 7938113069 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7940210221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7940210227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84470275 + ... + 84470368.

It is an arithmetic number, because the mean of its divisors is an integer number (2027287728).

Almost surely, 2^7940210221 is an apocalyptic number.

It is an amenable number.

7940210221 is a deficient number, since it is larger than the sum of its proper divisors (168940691).

7940210221 is a wasteful number, since it uses less digits than its factorization.

7940210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168940690.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 7940210221 is about 89107.8572349263. The cubic root of 7940210221 is about 1995.0050540593.

The spelling of 7940210221 in words is "seven billion, nine hundred forty million, two hundred ten thousand, two hundred twenty-one".