121200421 has 4 divisors (see below), whose sum is σ = 125110144. Its totient is φ = 117290700.

The previous prime is 121200413. The next prime is 121200439. The reversal of 121200421 is 124002121.

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 a cyclic number.

It is not a de Polignac number, because 121200421 - 2³ = 121200413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121200461) 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, 1954815 + ... + 1954876.

It is an arithmetic number, because the mean of its divisors is an integer number (31277536).

Almost surely, 2^121200421 is an apocalyptic number.

It is an amenable number.

121200421 is a deficient number, since it is larger than the sum of its proper divisors (3909723).

121200421 is an equidigital number, since it uses as much as digits as its factorization.

121200421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3909722.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 121200421 is about 11009.1062761697. The cubic root of 121200421 is about 494.8816790285.

Adding to 121200421 its reverse (124002121), we get a palindrome (245202542).

The spelling of 121200421 in words is "one hundred twenty-one million, two hundred thousand, four hundred twenty-one".