21213333103 has 4 divisors (see below), whose sum is σ = 21235180968. Its totient is φ = 21191485240.

The previous prime is 21213333083. The next prime is 21213333109. The reversal of 21213333103 is 30133331212.

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 21213333103 - 2²⁵ = 21179778671 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 (21213333109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10922476 + ... + 10924417.

It is an arithmetic number, because the mean of its divisors is an integer number (5308795242).

Almost surely, 2^21213333103 is an apocalyptic number.

21213333103 is a deficient number, since it is larger than the sum of its proper divisors (21847865).

21213333103 is an equidigital number, since it uses as much as digits as its factorization.

21213333103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21847864.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 21213333103 its reverse (30133331212), we get a palindrome (51346664315).

The spelling of 21213333103 in words is "twenty-one billion, two hundred thirteen million, three hundred thirty-three thousand, one hundred three".