121425891 has 8 divisors (see below), whose sum is σ = 163386960. Its totient is φ = 80207712.

The previous prime is 121425877. The next prime is 121425893. The reversal of 121425891 is 198524121.

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

It is not a de Polignac number, because 121425891 - 2⁵ = 121425859 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (121425893) 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, 185340 + ... + 185993.

It is an arithmetic number, because the mean of its divisors is an integer number (20423370).

Almost surely, 2^121425891 is an apocalyptic number.

121425891 is a deficient number, since it is larger than the sum of its proper divisors (41961069).

121425891 is a wasteful number, since it uses less digits than its factorization.

121425891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371445.

The product of its digits is 5760, while the sum is 33.

The square root of 121425891 is about 11019.3416772510. The cubic root of 121425891 is about 495.1883662249.

The spelling of 121425891 in words is "one hundred twenty-one million, four hundred twenty-five thousand, eight hundred ninety-one".