121191902 has 16 divisors (see below), whose sum is σ = 195956880. Its totient is φ = 55881792.

The previous prime is 121191901. The next prime is 121191907. The reversal of 121191902 is 209191121.

It is a super-2 number, since 2×121191902² = 29374954220755208, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121191901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44249 + ... + 46907.

It is an arithmetic number, because the mean of its divisors is an integer number (12247305).

Almost surely, 2^121191902 is an apocalyptic number.

121191902 is a deficient number, since it is larger than the sum of its proper divisors (74764978).

121191902 is a wasteful number, since it uses less digits than its factorization.

121191902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4427.

The product of its (nonzero) digits is 324, while the sum is 26.

The square root of 121191902 is about 11008.7193623963. The cubic root of 121191902 is about 494.8700839208.

The spelling of 121191902 in words is "one hundred twenty-one million, one hundred ninety-one thousand, nine hundred two".