421551023 has 4 divisors (see below), whose sum is σ = 446348160. Its totient is φ = 396753888.

The previous prime is 421551017. The next prime is 421551103. The reversal of 421551023 is 320155124.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 421551023 - 2⁶ = 421550959 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 421551023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421550023) 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, 12398543 + ... + 12398576.

It is an arithmetic number, because the mean of its divisors is an integer number (111587040).

Almost surely, 2^421551023 is an apocalyptic number.

421551023 is a deficient number, since it is larger than the sum of its proper divisors (24797137).

421551023 is a wasteful number, since it uses less digits than its factorization.

421551023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24797136.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 421551023 is about 20531.7077467998. The cubic root of 421551023 is about 749.8079644636.

The spelling of 421551023 in words is "four hundred twenty-one million, five hundred fifty-one thousand, twenty-three".