421231993 has 24 divisors (see below), whose sum is σ = 526501248. Its totient is φ = 329951232.

The previous prime is 421231903. The next prime is 421231997. The reversal of 421231993 is 399132124.

It is not a de Polignac number, because 421231993 - 2¹⁷ = 421100921 is a prime.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (421231997) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 120121 + ... + 123577.

It is an arithmetic number, because the mean of its divisors is an integer number (21937552).

Almost surely, 2^421231993 is an apocalyptic number.

It is an amenable number.

421231993 is a deficient number, since it is larger than the sum of its proper divisors (105269255).

421231993 is a wasteful number, since it uses less digits than its factorization.

421231993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3593 (or 3580 counting only the distinct ones).

The product of its digits is 11664, while the sum is 34.

The square root of 421231993 is about 20523.9370735734. The cubic root of 421231993 is about 749.6187650609.

It can be divided in two parts, 421231 and 993, that added together give a palindrome (422224).

The spelling of 421231993 in words is "four hundred twenty-one million, two hundred thirty-one thousand, nine hundred ninety-three".