421020453 has 16 divisors (see below), whose sum is σ = 679294080. Its totient is φ = 226430976.

The previous prime is 421020427. The next prime is 421020461. The reversal of 421020453 is 354020124.

It is not a de Polignac number, because 421020453 - 2⁶ = 421020389 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421020053) 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 15 ways as a sum of consecutive naturals, for example, 589308 + ... + 590021.

It is an arithmetic number, because the mean of its divisors is an integer number (42455880).

Almost surely, 2^421020453 is an apocalyptic number.

It is an amenable number.

421020453 is a deficient number, since it is larger than the sum of its proper divisors (258273627).

421020453 is a wasteful number, since it uses less digits than its factorization.

421020453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1179356.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 421020453 is about 20518.7829317433. The cubic root of 421020453 is about 749.4932594736.

Adding to 421020453 its reverse (354020124), we get a palindrome (775040577).

The spelling of 421020453 in words is "four hundred twenty-one million, twenty thousand, four hundred fifty-three".