123012221 has 4 divisors (see below), whose sum is σ = 130248252. Its totient is φ = 115776192.

The previous prime is 123012203. The next prime is 123012223. The reversal of 123012221 is 122210321.

It is a happy number.

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 105288121 + 17724100 = 10261^2 + 4210^2 .

It is a cyclic number.

It is not a de Polignac number, because 123012221 - 2⁶ = 123012157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123012196 and 123012205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123012223) 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, 3617990 + ... + 3618023.

It is an arithmetic number, because the mean of its divisors is an integer number (32562063).

Almost surely, 2^123012221 is an apocalyptic number.

It is an amenable number.

123012221 is a deficient number, since it is larger than the sum of its proper divisors (7236031).

123012221 is an equidigital number, since it uses as much as digits as its factorization.

123012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7236030.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 123012221 is about 11091.0874579547. The cubic root of 123012221 is about 497.3354536087.

Adding to 123012221 its reverse (122210321), we get a palindrome (245222542).

The spelling of 123012221 in words is "one hundred twenty-three million, twelve thousand, two hundred twenty-one".