21423000403 has 8 divisors (see below), whose sum is σ = 25772030720. Its totient is φ = 17396120520.

The previous prime is 21423000383. The next prime is 21423000409. The reversal of 21423000403 is 30400032412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21423000403 - 2⁹ = 21422999891 is a prime.

It is a super-3 number, since 3×21423000403³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21423000409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80537463 + ... + 80537728.

It is an arithmetic number, because the mean of its divisors is an integer number (3221503840).

Almost surely, 2^21423000403 is an apocalyptic number.

21423000403 is a deficient number, since it is larger than the sum of its proper divisors (4349030317).

21423000403 is a wasteful number, since it uses less digits than its factorization.

21423000403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161075217.

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

Adding to 21423000403 its reverse (30400032412), we get a palindrome (51823032815).

The spelling of 21423000403 in words is "twenty-one billion, four hundred twenty-three million, four hundred three", and thus it is an aban number.