7992012221 has 4 divisors (see below), whose sum is σ = 8066704032. Its totient is φ = 7917320412.

The previous prime is 7992012209. The next prime is 7992012229. The reversal of 7992012221 is 1222102997.

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.

It is a cyclic number.

It is not a de Polignac number, because 7992012221 - 2⁶ = 7992012157 is a prime.

It is a super-2 number, since 2×7992012221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7992012229) 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, 37345745 + ... + 37345958.

It is an arithmetic number, because the mean of its divisors is an integer number (2016676008).

Almost surely, 2^7992012221 is an apocalyptic number.

It is an amenable number.

7992012221 is a deficient number, since it is larger than the sum of its proper divisors (74691811).

7992012221 is a wasteful number, since it uses less digits than its factorization.

7992012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74691810.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 7992012221 is about 89398.0549061332. The cubic root of 7992012221 is about 1999.3341300832.

The spelling of 7992012221 in words is "seven billion, nine hundred ninety-two million, twelve thousand, two hundred twenty-one".