121210421 has 8 divisors (see below), whose sum is σ = 124190880. Its totient is φ = 118237392.

The previous prime is 121210399. The next prime is 121210429. The reversal of 121210421 is 124012121.

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 121210421 - 2¹⁰ = 121209397 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121210396 and 121210405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121210429) 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, 45710 + ... + 48288.

It is an arithmetic number, because the mean of its divisors is an integer number (15523860).

Almost surely, 2^121210421 is an apocalyptic number.

It is an amenable number.

121210421 is a deficient number, since it is larger than the sum of its proper divisors (2980459).

121210421 is a wasteful number, since it uses less digits than its factorization.

121210421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3715.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 121210421 is about 11009.5604362754. The cubic root of 121210421 is about 494.8952892141.

Adding to 121210421 its reverse (124012121), we get a palindrome (245222542).

The spelling of 121210421 in words is "one hundred twenty-one million, two hundred ten thousand, four hundred twenty-one".