7211513891 has 16 divisors (see below), whose sum is σ = 7417077120. Its totient is φ = 7009054080.

The previous prime is 7211513867. The next prime is 7211513899. The reversal of 7211513891 is 1983151127.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 7211513891 - 2¹⁴ = 7211497507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7211513899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3272396 + ... + 3274598.

It is an arithmetic number, because the mean of its divisors is an integer number (463567320).

Almost surely, 2^7211513891 is an apocalyptic number.

7211513891 is a deficient number, since it is larger than the sum of its proper divisors (205563229).

7211513891 is a wasteful number, since it uses less digits than its factorization.

7211513891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2866.

The product of its digits is 15120, while the sum is 38.

The square root of 7211513891 is about 84920.6328933081. The cubic root of 7211513891 is about 1932.0075302407.

The spelling of 7211513891 in words is "seven billion, two hundred eleven million, five hundred thirteen thousand, eight hundred ninety-one".