123242213531 has 4 divisors (see below), whose sum is σ = 123344831064. Its totient is φ = 123139596000.

The previous prime is 123242213513. The next prime is 123242213533. The reversal of 123242213531 is 135312242321.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123242213531 is a prime.

It is a super-2 number, since 2×123242213531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123242213494 and 123242213503.

It is not an unprimeable number, because it can be changed into a prime (123242213533) 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, 51306965 + ... + 51309366.

It is an arithmetic number, because the mean of its divisors is an integer number (30836207766).

Almost surely, 2^123242213531 is an apocalyptic number.

123242213531 is a deficient number, since it is larger than the sum of its proper divisors (102617533).

123242213531 is a wasteful number, since it uses less digits than its factorization.

123242213531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102617532.

The product of its digits is 8640, while the sum is 29.

Adding to 123242213531 its reverse (135312242321), we get a palindrome (258554455852).

The spelling of 123242213531 in words is "one hundred twenty-three billion, two hundred forty-two million, two hundred thirteen thousand, five hundred thirty-one".