123421355331 has 4 divisors (see below), whose sum is σ = 164561807112. Its totient is φ = 82280903552.

The previous prime is 123421355269. The next prime is 123421355353. The reversal of 123421355331 is 133553124321.

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

It is a cyclic number.

It is not a de Polignac number, because 123421355331 - 2⁷ = 123421355203 is a prime.

It is a super-2 number, since 2×123421355331² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 123421355292 and 123421355301.

It is not an unprimeable number, because it can be changed into a prime (123421355231) 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, 20570225886 + ... + 20570225891.

It is an arithmetic number, because the mean of its divisors is an integer number (41140451778).

Almost surely, 2^123421355331 is an apocalyptic number.

123421355331 is a deficient number, since it is larger than the sum of its proper divisors (41140451781).

123421355331 is an equidigital number, since it uses as much as digits as its factorization.

123421355331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41140451780.

The product of its digits is 32400, while the sum is 33.

Adding to 123421355331 its reverse (133553124321), we get a palindrome (256974479652).

The spelling of 123421355331 in words is "one hundred twenty-three billion, four hundred twenty-one million, three hundred fifty-five thousand, three hundred thirty-one".