123401221 has 2 divisors, whose sum is σ = 123401222. Its totient is φ = 123401220.

The previous prime is 123401209. The next prime is 123401261. The reversal of 123401221 is 122104321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68062500 + 55338721 = 8250^2 + 7439^2 .

It is an emirp because it is prime and its reverse (122104321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123401221 - 2¹¹ = 123399173 is a prime.

It is a super-2 number, since 2×123401221² = 30455722688581682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 123401195 and 123401204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123401261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61700610 + 61700611.

It is an arithmetic number, because the mean of its divisors is an integer number (61700611).

Almost surely, 2^123401221 is an apocalyptic number.

It is an amenable number.

123401221 is a deficient number, since it is larger than the sum of its proper divisors (1).

123401221 is an equidigital number, since it uses as much as digits as its factorization.

123401221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 123401221 is about 11108.6102191048. The cubic root of 123401221 is about 497.8591411967.

Adding to 123401221 its reverse (122104321), we get a palindrome (245505542).

The spelling of 123401221 in words is "one hundred twenty-three million, four hundred one thousand, two hundred twenty-one".