7216465921 has 4 divisors (see below), whose sum is σ = 8247389632. Its totient is φ = 6185542212.

The previous prime is 7216465891. The next prime is 7216465951. The reversal of 7216465921 is 1295646127.

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 an interprime number because it is at equal distance from previous prime (7216465891) and next prime (7216465951).

It is a cyclic number.

It is not a de Polignac number, because 7216465921 - 2¹⁵ = 7216433153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7216465951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 515461845 + ... + 515461858.

It is an arithmetic number, because the mean of its divisors is an integer number (2061847408).

Almost surely, 2^7216465921 is an apocalyptic number.

It is an amenable number.

7216465921 is a deficient number, since it is larger than the sum of its proper divisors (1030923711).

7216465921 is a wasteful number, since it uses less digits than its factorization.

7216465921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1030923710.

The product of its digits is 181440, while the sum is 43.

The square root of 7216465921 is about 84949.7847024935. The cubic root of 7216465921 is about 1932.4496551682.

The spelling of 7216465921 in words is "seven billion, two hundred sixteen million, four hundred sixty-five thousand, nine hundred twenty-one".