421014021 has 4 divisors (see below), whose sum is σ = 561352032. Its totient is φ = 280676012.

The previous prime is 421014001. The next prime is 421014023. The reversal of 421014021 is 120410124.

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 421014021 - 2²⁶ = 353905157 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421014023) 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, 70169001 + ... + 70169006.

It is an arithmetic number, because the mean of its divisors is an integer number (140338008).

Almost surely, 2^421014021 is an apocalyptic number.

It is an amenable number.

421014021 is a deficient number, since it is larger than the sum of its proper divisors (140338011).

421014021 is a wasteful number, since it uses less digits than its factorization.

421014021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140338010.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 421014021 is about 20518.6261967024. The cubic root of 421014021 is about 749.4894427428.

Adding to 421014021 its reverse (120410124), we get a palindrome (541424145).

The spelling of 421014021 in words is "four hundred twenty-one million, fourteen thousand, twenty-one".