121204021 has 8 divisors (see below), whose sum is σ = 131983200. Its totient is φ = 110864880.

The previous prime is 121204019. The next prime is 121204051. The reversal of 121204021 is 120402121.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 121204021 - 2¹ = 121204019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121203992 and 121204010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121204001) 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, 109435 + ... + 110536.

It is an arithmetic number, because the mean of its divisors is an integer number (16497900).

Almost surely, 2^121204021 is an apocalyptic number.

It is an amenable number.

121204021 is a deficient number, since it is larger than the sum of its proper divisors (10779179).

121204021 is a wasteful number, since it uses less digits than its factorization.

121204021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220019.

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

The square root of 121204021 is about 11009.2697759661. The cubic root of 121204021 is about 494.8865787816.

Adding to 121204021 its reverse (120402121), we get a palindrome (241606142).

The spelling of 121204021 in words is "one hundred twenty-one million, two hundred four thousand, twenty-one".