21404342003 has 4 divisors (see below), whose sum is σ = 23350191288. Its totient is φ = 19458492720.

The previous prime is 21404341999. The next prime is 21404342021. The reversal of 21404342003 is 30024340412.

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 21404342003 - 2² = 21404341999 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 21404342003.

It is not an unprimeable number, because it can be changed into a prime (21404342093) 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, 972924626 + ... + 972924647.

It is an arithmetic number, because the mean of its divisors is an integer number (5837547822).

Almost surely, 2^21404342003 is an apocalyptic number.

21404342003 is a deficient number, since it is larger than the sum of its proper divisors (1945849285).

21404342003 is a wasteful number, since it uses less digits than its factorization.

21404342003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1945849284.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21404342003 its reverse (30024340412), we get a palindrome (51428682415).

The spelling of 21404342003 in words is "twenty-one billion, four hundred four million, three hundred forty-two thousand, three".