21321231202103 has 4 divisors (see below), whose sum is σ = 24367121373840. Its totient is φ = 18275341030368.

The previous prime is 21321231202067. The next prime is 21321231202109. The reversal of 21321231202103 is 30120213212312.

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 21321231202103 - 2¹⁸ = 21321230939959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321231202109) 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, 1522945085858 + ... + 1522945085871.

It is an arithmetic number, because the mean of its divisors is an integer number (6091780343460).

Almost surely, 2^{21321231202103} is an apocalyptic number.

21321231202103 is a deficient number, since it is larger than the sum of its proper divisors (3045890171737).

21321231202103 is an equidigital number, since it uses as much as digits as its factorization.

21321231202103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3045890171736.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21321231202103 its reverse (30120213212312), we get a palindrome (51441444414415).

The spelling of 21321231202103 in words is "twenty-one trillion, three hundred twenty-one billion, two hundred thirty-one million, two hundred two thousand, one hundred three".