21021433103 has 4 divisors (see below), whose sum is σ = 22932472488. Its totient is φ = 19110393720.

The previous prime is 21021433099. The next prime is 21021433109. The reversal of 21021433103 is 30133412012.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21021433103 - 2² = 21021433099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021433109) 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, 955519676 + ... + 955519697.

It is an arithmetic number, because the mean of its divisors is an integer number (5733118122).

Almost surely, 2^21021433103 is an apocalyptic number.

21021433103 is a deficient number, since it is larger than the sum of its proper divisors (1911039385).

21021433103 is a wasteful number, since it uses less digits than its factorization.

21021433103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911039384.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21021433103 its reverse (30133412012), we get a palindrome (51154845115).

The spelling of 21021433103 in words is "twenty-one billion, twenty-one million, four hundred thirty-three thousand, one hundred three".