123456221401 has 2 divisors, whose sum is σ = 123456221402. Its totient is φ = 123456221400.

The previous prime is 123456221393. The next prime is 123456221461. The reversal of 123456221401 is 104122654321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112949766400 + 10506455001 = 336080^2 + 102501^2 .

It is a cyclic number.

It is not a de Polignac number, because 123456221401 - 2³ = 123456221393 is a prime.

It is a super-2 number, since 2×123456221401² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (123456221461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61728110700 + 61728110701.

It is an arithmetic number, because the mean of its divisors is an integer number (61728110701).

Almost surely, 2^123456221401 is an apocalyptic number.

It is an amenable number.

123456221401 is a deficient number, since it is larger than the sum of its proper divisors (1).

123456221401 is an equidigital number, since it uses as much as digits as its factorization.

123456221401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 31.

Adding to 123456221401 its reverse (104122654321), we get a palindrome (227578875722).

The spelling of 123456221401 in words is "one hundred twenty-three billion, four hundred fifty-six million, two hundred twenty-one thousand, four hundred one".