421340023 has 4 divisors (see below), whose sum is σ = 453750808. Its totient is φ = 388929240.

The previous prime is 421340021. The next prime is 421340039. The reversal of 421340023 is 320043124.

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

It is a cyclic number.

It is not a de Polignac number, because 421340023 - 2¹ = 421340021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421340021) 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, 16205373 + ... + 16205398.

It is an arithmetic number, because the mean of its divisors is an integer number (113437702).

Almost surely, 2^421340023 is an apocalyptic number.

421340023 is a deficient number, since it is larger than the sum of its proper divisors (32410785).

421340023 is a wasteful number, since it uses less digits than its factorization.

421340023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32410784.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 421340023 is about 20526.5687098453. The cubic root of 421340023 is about 749.6828424930.

Adding to 421340023 its reverse (320043124), we get a palindrome (741383147).

The spelling of 421340023 in words is "four hundred twenty-one million, three hundred forty thousand, twenty-three".