7211881 has 4 divisors (see below), whose sum is σ = 7227792. Its totient is φ = 7195972.

The previous prime is 7211879. The next prime is 7211899. The reversal of 7211881 is 1881127.

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 7211881 - 2¹ = 7211879 is a prime.

It is a super-2 number, since 2×7211881² = 104022455116322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7211801) 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, 7255 + ... + 8188.

It is an arithmetic number, because the mean of its divisors is an integer number (1806948).

Almost surely, 2^7211881 is an apocalyptic number.

It is an amenable number.

7211881 is a deficient number, since it is larger than the sum of its proper divisors (15911).

7211881 is a wasteful number, since it uses less digits than its factorization.

7211881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15910.

The product of its digits is 896, while the sum is 28.

The square root of 7211881 is about 2685.4945540812. The cubic root of 7211881 is about 193.2040313247.

The spelling of 7211881 in words is "seven million, two hundred eleven thousand, eight hundred eighty-one".