121722 has 8 divisors (see below), whose sum is σ = 243456. Its totient is φ = 40572.

The previous prime is 121721. The next prime is 121727. The reversal of 121722 is 227121.

It is a sphenic number, since it is the product of 3 distinct primes.

121722 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (121721) 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, 10138 + ... + 10149.

It is an arithmetic number, because the mean of its divisors is an integer number (30432).

2¹²¹⁷²² is an apocalyptic number.

121722 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

121722 is a wasteful number, since it uses less digits than its factorization.

121722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20292.

The product of its digits is 56, while the sum is 15.

The square root of 121722 is about 348.8868011261. The cubic root of 121722 is about 49.5590561346.

Adding to 121722 its reverse (227121), we get a palindrome (348843).

The spelling of 121722 in words is "one hundred twenty-one thousand, seven hundred twenty-two", and thus it is an iban number.