121402421 has 8 divisors (see below), whose sum is σ = 139015104. Its totient is φ = 103857120.

The previous prime is 121402367. The next prime is 121402427. The reversal of 121402421 is 124204121.

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 121402421 - 2²⁶ = 54293557 is a prime.

It is a super-2 number, since 2×121402421² = 29477095649322482, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 121402421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121402427) 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, 12920 + ... + 20241.

It is an arithmetic number, because the mean of its divisors is an integer number (17376888).

Almost surely, 2^121402421 is an apocalyptic number.

It is an amenable number.

121402421 is a deficient number, since it is larger than the sum of its proper divisors (17612683).

121402421 is an equidigital number, since it uses as much as digits as its factorization.

121402421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33691.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 121402421 is about 11018.2766801347. The cubic root of 121402421 is about 495.1564597407.

Adding to 121402421 its reverse (124204121), we get a palindrome (245606542).

The spelling of 121402421 in words is "one hundred twenty-one million, four hundred two thousand, four hundred twenty-one".