122721172 has 24 divisors (see below), whose sum is σ = 245686784. Its totient is φ = 52542432.

The previous prime is 122721167. The next prime is 122721191. The reversal of 122721172 is 271127221.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42478 + ... + 45274.

Almost surely, 2^122721172 is an apocalyptic number.

It is an amenable number.

122721172 is an abundant number, since it is smaller than the sum of its proper divisors (122965612).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

122721172 is a wasteful number, since it uses less digits than its factorization.

122721172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4375 (or 4373 counting only the distinct ones).

The product of its digits is 784, while the sum is 25.

The square root of 122721172 is about 11077.9588372588. The cubic root of 122721172 is about 496.9429091524.

Adding to 122721172 its reverse (271127221), we get a palindrome (393848393).

The spelling of 122721172 in words is "one hundred twenty-two million, seven hundred twenty-one thousand, one hundred seventy-two".