7387972021 has 4 divisors (see below), whose sum is σ = 7400558592. Its totient is φ = 7375385452.

The previous prime is 7387972019. The next prime is 7387972037. The reversal of 7387972021 is 1202797837.

It is a happy number.

7387972021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 7387972021 - 2¹ = 7387972019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7387972001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6292405 + ... + 6293578.

It is an arithmetic number, because the mean of its divisors is an integer number (1850139648).

Almost surely, 2^7387972021 is an apocalyptic number.

It is an amenable number.

7387972021 is a deficient number, since it is larger than the sum of its proper divisors (12586571).

7387972021 is a wasteful number, since it uses less digits than its factorization.

7387972021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12586570.

The product of its (nonzero) digits is 296352, while the sum is 46.

The square root of 7387972021 is about 85953.3130309705. The cubic root of 7387972021 is about 1947.6387831160.

The spelling of 7387972021 in words is "seven billion, three hundred eighty-seven million, nine hundred seventy-two thousand, twenty-one".