7213111123 has 4 divisors (see below), whose sum is σ = 7213281768. Its totient is φ = 7212940480.

The previous prime is 7213111117. The next prime is 7213111163. The reversal of 7213111123 is 3211113127.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 7213111123 - 2¹³ = 7213102931 is a prime.

It is a super-2 number, since 2×7213111123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7213111094 and 7213111103.

It is not an unprimeable number, because it can be changed into a prime (7213111163) 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, 30408 + ... + 123898.

It is an arithmetic number, because the mean of its divisors is an integer number (1803320442).

Almost surely, 2^7213111123 is an apocalyptic number.

7213111123 is a deficient number, since it is larger than the sum of its proper divisors (170645).

7213111123 is an equidigital number, since it uses as much as digits as its factorization.

7213111123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170644.

The product of its digits is 252, while the sum is 22.

The square root of 7213111123 is about 84930.0366360453. The cubic root of 7213111123 is about 1932.1501557006.

It can be divided in two parts, 7213 and 111123, that added together give a square (118336 = 344²).

The spelling of 7213111123 in words is "seven billion, two hundred thirteen million, one hundred eleven thousand, one hundred twenty-three".