121990902 has 16 divisors (see below), whose sum is σ = 266162112. Its totient is φ = 36966920.

The previous prime is 121990901. The next prime is 121990933. The reversal of 121990902 is 209099121.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121990901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 924108 + ... + 924239.

It is an arithmetic number, because the mean of its divisors is an integer number (16635132).

Almost surely, 2^121990902 is an apocalyptic number.

121990902 is an abundant number, since it is smaller than the sum of its proper divisors (144171210).

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

121990902 is a wasteful number, since it uses less digits than its factorization.

121990902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1848363.

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 121990902 is about 11044.9491624000. The cubic root of 121990902 is about 495.9552373539.

The spelling of 121990902 in words is "one hundred twenty-one million, nine hundred ninety thousand, nine hundred two".