421429121 has 4 divisors (see below), whose sum is σ = 421480752. Its totient is φ = 421377492.

The previous prime is 421429117. The next prime is 421429171. The reversal of 421429121 is 121924124.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 421429121 - 2² = 421429117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421429171) 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, 10571 + ... + 30896.

It is an arithmetic number, because the mean of its divisors is an integer number (105370188).

Almost surely, 2^421429121 is an apocalyptic number.

It is an amenable number.

421429121 is a deficient number, since it is larger than the sum of its proper divisors (51631).

421429121 is a wasteful number, since it uses less digits than its factorization.

421429121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51630.

The product of its digits is 1152, while the sum is 26.

The square root of 421429121 is about 20528.7389042776. The cubic root of 421429121 is about 749.7356822665.

The spelling of 421429121 in words is "four hundred twenty-one million, four hundred twenty-nine thousand, one hundred twenty-one".