123113532221 has 4 divisors (see below), whose sum is σ = 123157488444. Its totient is φ = 123069576000.

The previous prime is 123113532209. The next prime is 123113532251. The reversal of 123113532221 is 122235311321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 54529255225 + 68584276996 = 233515^2 + 261886^2 .

It is a cyclic number.

It is not a de Polignac number, because 123113532221 - 2²² = 123109337917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123113532251) 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, 21973910 + ... + 21979511.

It is an arithmetic number, because the mean of its divisors is an integer number (30789372111).

Almost surely, 2^123113532221 is an apocalyptic number.

It is an amenable number.

123113532221 is a deficient number, since it is larger than the sum of its proper divisors (43956223).

123113532221 is an equidigital number, since it uses as much as digits as its factorization.

123113532221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43956222.

The product of its digits is 2160, while the sum is 26.

Adding to 123113532221 its reverse (122235311321), we get a palindrome (245348843542).

The spelling of 123113532221 in words is "one hundred twenty-three billion, one hundred thirteen million, five hundred thirty-two thousand, two hundred twenty-one".