123721210072 has 16 divisors (see below), whose sum is σ = 233646172200. Its totient is φ = 61415564160.

The previous prime is 123721210051. The next prime is 123721210073. The reversal of 123721210072 is 270012127321.

It is a self number, because there is not a number n which added to its sum of digits gives 123721210072.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123721210073) 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, 55628929 + ... + 55631152.

Almost surely, 2^123721210072 is an apocalyptic number.

It is an amenable number.

123721210072 is a deficient number, since it is larger than the sum of its proper divisors (109924962128).

123721210072 is a wasteful number, since it uses less digits than its factorization.

123721210072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111260226 (or 111260222 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 28.

Adding to 123721210072 its reverse (270012127321), we get a palindrome (393733337393).

The spelling of 123721210072 in words is "one hundred twenty-three billion, seven hundred twenty-one million, two hundred ten thousand, seventy-two".