121400121 has 4 divisors (see below), whose sum is σ = 161866832. Its totient is φ = 80933412.

The previous prime is 121400099. The next prime is 121400129. The reversal of 121400121 is 121004121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 121400121 - 2⁵ = 121400089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121400097 and 121400106.

It is not an unprimeable number, because it can be changed into a prime (121400129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20233351 + ... + 20233356.

It is an arithmetic number, because the mean of its divisors is an integer number (40466708).

Almost surely, 2^121400121 is an apocalyptic number.

It is an amenable number.

121400121 is a deficient number, since it is larger than the sum of its proper divisors (40466711).

121400121 is an equidigital number, since it uses as much as digits as its factorization.

121400121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40466710.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 121400121 is about 11018.1723076017. The cubic root of 121400121 is about 495.1533327656.

Adding to 121400121 its reverse (121004121), we get a palindrome (242404242).

The spelling of 121400121 in words is "one hundred twenty-one million, four hundred thousand, one hundred twenty-one".