21403003430 has 64 divisors (see below), whose sum is σ = 39713587200. Its totient is φ = 8301888000.

The previous prime is 21403003411. The next prime is 21403003439. The reversal of 21403003430 is 3430030412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21403003439) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16733531 + ... + 16734809.

It is an arithmetic number, because the mean of its divisors is an integer number (620524800).

Almost surely, 2^21403003430 is an apocalyptic number.

21403003430 is a deficient number, since it is larger than the sum of its proper divisors (18310583770).

21403003430 is a wasteful number, since it uses less digits than its factorization.

21403003430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1709.

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 21403003430 its reverse (3430030412), we get a palindrome (24833033842).

The spelling of 21403003430 in words is "twenty-one billion, four hundred three million, three thousand, four hundred thirty".