421012121 has 4 divisors (see below), whose sum is σ = 427295952. Its totient is φ = 414728292.

The previous prime is 421012087. The next prime is 421012129. The reversal of 421012121 is 121210124.

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 421012121 - 2²⁶ = 353903257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 421012096 and 421012105.

It is not an unprimeable number, because it can be changed into a prime (421012129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3141815 + ... + 3141948.

It is an arithmetic number, because the mean of its divisors is an integer number (106823988).

Almost surely, 2^421012121 is an apocalyptic number.

It is an amenable number.

421012121 is a deficient number, since it is larger than the sum of its proper divisors (6283831).

421012121 is an equidigital number, since it uses as much as digits as its factorization.

421012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6283830.

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

The square root of 421012121 is about 20518.5798972541. The cubic root of 421012121 is about 749.4883152807.

Adding to 421012121 its reverse (121210124), we get a palindrome (542222245).

The spelling of 421012121 in words is "four hundred twenty-one million, twelve thousand, one hundred twenty-one".