121191928 has 96 divisors (see below), whose sum is σ = 278672400. Its totient is φ = 48921600.

The previous prime is 121191919. The next prime is 121191949. The reversal of 121191928 is 829191121.

It is a junction number, because it is equal to n+sod(n) for n = 121191893 and 121191902.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 431148 + ... + 431428.

Almost surely, 2^121191928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121191928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139336200).

121191928 is an abundant number, since it is smaller than the sum of its proper divisors (157480472).

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

121191928 is a wasteful number, since it uses less digits than its factorization.

121191928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353 (or 336 counting only the distinct ones).

The product of its digits is 2592, while the sum is 34.

The square root of 121191928 is about 11008.7205432784. The cubic root of 121191928 is about 494.8701193099.

It can be divided in two parts, 1211 and 91928, that added together give a palindrome (93139).

The spelling of 121191928 in words is "one hundred twenty-one million, one hundred ninety-one thousand, nine hundred twenty-eight".