121902 has 16 divisors (see below), whose sum is σ = 266112. Its totient is φ = 36920.

The previous prime is 121889. The next prime is 121909. The reversal of 121902 is 209121.

It is a happy number.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121909) by changing a digit.

121902 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 858 + ... + 989.

It is an arithmetic number, because the mean of its divisors is an integer number (16632).

2¹²¹⁹⁰² is an apocalyptic number.

121902 is an abundant number, since it is smaller than the sum of its proper divisors (144210).

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

121902 is a wasteful number, since it uses less digits than its factorization.

121902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1863.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 121902 is about 349.1446691559. The cubic root of 121902 is about 49.5834730751.

The spelling of 121902 in words is "one hundred twenty-one thousand, nine hundred two".