123130221 has 4 divisors (see below), whose sum is σ = 164173632. Its totient is φ = 82086812.

The previous prime is 123130219. The next prime is 123130223. The reversal of 123130221 is 122031321.

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 an interprime number because it is at equal distance from previous prime (123130219) and next prime (123130223).

It is a cyclic number.

It is not a de Polignac number, because 123130221 - 2¹ = 123130219 is a prime.

It is a super-2 number, since 2×123130221² = 30322102647017682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 123130221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123130223) 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, 20521701 + ... + 20521706.

It is an arithmetic number, because the mean of its divisors is an integer number (41043408).

Almost surely, 2^123130221 is an apocalyptic number.

It is an amenable number.

123130221 is a deficient number, since it is larger than the sum of its proper divisors (41043411).

123130221 is an equidigital number, since it uses as much as digits as its factorization.

123130221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41043410.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 123130221 is about 11096.4057694372. The cubic root of 123130221 is about 497.4944265093.

Adding to 123130221 its reverse (122031321), we get a palindrome (245161542).

The spelling of 123130221 in words is "one hundred twenty-three million, one hundred thirty thousand, two hundred twenty-one".