7399972121 has 8 divisors (see below), whose sum is σ = 7436149344. Its totient is φ = 7363833120.

The previous prime is 7399972103. The next prime is 7399972133. The reversal of 7399972121 is 1212799937.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7399972121 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 7399972121.

It is not an unprimeable number, because it can be changed into a prime (7399972171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 426506 + ... + 443516.

It is an arithmetic number, because the mean of its divisors is an integer number (929518668).

Almost surely, 2^7399972121 is an apocalyptic number.

It is an amenable number.

7399972121 is a deficient number, since it is larger than the sum of its proper divisors (36177223).

7399972121 is a wasteful number, since it uses less digits than its factorization.

7399972121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19111.

The product of its digits is 428652, while the sum is 50.

The square root of 7399972121 is about 86023.0906268776. The cubic root of 7399972121 is about 1948.6927131791.

The spelling of 7399972121 in words is "seven billion, three hundred ninety-nine million, nine hundred seventy-two thousand, one hundred twenty-one".