21432003442 has 8 divisors (see below), whose sum is σ = 32148672732. Its totient is φ = 10715779200.

The previous prime is 21432003427. The next prime is 21432003499. The reversal of 21432003442 is 24430023412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17991125161 + 3440878281 = 134131^2 + 58659^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64942 + ... + 216982.

Almost surely, 2^21432003442 is an apocalyptic number.

21432003442 is a deficient number, since it is larger than the sum of its proper divisors (10716669290).

21432003442 is a wasteful number, since it uses less digits than its factorization.

21432003442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222524.

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 21432003442 its reverse (24430023412), we get a palindrome (45862026854).

The spelling of 21432003442 in words is "twenty-one billion, four hundred thirty-two million, three thousand, four hundred forty-two".