21430012003 has 4 divisors (see below), whose sum is σ = 21467675160. Its totient is φ = 21392348848.

The previous prime is 21430011989. The next prime is 21430012013. The reversal of 21430012003 is 30021003412.

It is a happy number.

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 21430012003 - 2²⁹ = 20893141091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21430012013) 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, 18830725 + ... + 18831862.

It is an arithmetic number, because the mean of its divisors is an integer number (5366918790).

Almost surely, 2^21430012003 is an apocalyptic number.

21430012003 is a deficient number, since it is larger than the sum of its proper divisors (37663157).

21430012003 is an equidigital number, since it uses as much as digits as its factorization.

21430012003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37663156.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21430012003 its reverse (30021003412), we get a palindrome (51451015415).

The spelling of 21430012003 in words is "twenty-one billion, four hundred thirty million, twelve thousand, three".