123216131572 has 24 divisors (see below), whose sum is σ = 220290134400. Its totient is φ = 60289896576.

The previous prime is 123216131569. The next prime is 123216131573. The reversal of 123216131572 is 275131612321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123216131573) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1689622 + ... + 1761037.

It is an arithmetic number, because the mean of its divisors is an integer number (9178755600).

Almost surely, 2^123216131572 is an apocalyptic number.

It is an amenable number.

123216131572 is a deficient number, since it is larger than the sum of its proper divisors (97074002828).

123216131572 is a wasteful number, since it uses less digits than its factorization.

123216131572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3450855 (or 3450853 counting only the distinct ones).

The product of its digits is 15120, while the sum is 34.

Adding to 123216131572 its reverse (275131612321), we get a palindrome (398347743893).

The spelling of 123216131572 in words is "one hundred twenty-three billion, two hundred sixteen million, one hundred thirty-one thousand, five hundred seventy-two".