7211110121 has 4 divisors (see below), whose sum is σ = 7524636672. Its totient is φ = 6897583572.

The previous prime is 7211110111. The next prime is 7211110157. The reversal of 7211110121 is 1210111127.

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 7211110121 - 2¹⁰ = 7211109097 is a prime.

It is a super-5 number, since 5×7211110121⁵ (a number of 50 digits) contains 55555 as substring.

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 7211110121.

It is not an unprimeable number, because it can be changed into a prime (7211110111) 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 3 ways as a sum of consecutive naturals, for example, 156763241 + ... + 156763286.

It is an arithmetic number, because the mean of its divisors is an integer number (1881159168).

Almost surely, 2^7211110121 is an apocalyptic number.

It is an amenable number.

7211110121 is a deficient number, since it is larger than the sum of its proper divisors (313526551).

7211110121 is a wasteful number, since it uses less digits than its factorization.

7211110121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313526550.

The product of its (nonzero) digits is 28, while the sum is 17.

The square root of 7211110121 is about 84918.2555225907. The cubic root of 7211110121 is about 1931.9714721050.

Adding to 7211110121 its reverse (1210111127), we get a palindrome (8421221248).

The spelling of 7211110121 in words is "seven billion, two hundred eleven million, one hundred ten thousand, one hundred twenty-one".