123142221 has 16 divisors (see below), whose sum is σ = 182705920. Its totient is φ = 81972000.

The previous prime is 123142219. The next prime is 123142223. The reversal of 123142221 is 122241321.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (123142219) and next prime (123142223).

It is not a de Polignac number, because 123142221 - 2¹ = 123142219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123142194 and 123142203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123142223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17241 + ... + 23313.

It is an arithmetic number, because the mean of its divisors is an integer number (11419120).

Almost surely, 2^123142221 is an apocalyptic number.

It is an amenable number.

123142221 is a deficient number, since it is larger than the sum of its proper divisors (59563699).

123142221 is an equidigital number, since it uses as much as digits as its factorization.

123142221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6833 (or 6827 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 123142221 is about 11096.9464718904. The cubic root of 123142221 is about 497.5105875544.

Adding to 123142221 its reverse (122241321), we get a palindrome (245383542).

It can be divided in two parts, 12314 and 2221, that added together give a triangular number (14535 = T₁₇₀).

The spelling of 123142221 in words is "one hundred twenty-three million, one hundred forty-two thousand, two hundred twenty-one".