21321121223103 has 32 divisors (see below), whose sum is σ = 32417785181376. Its totient is φ = 12348136931328.

The previous prime is 21321121222957. The next prime is 21321121223117. The reversal of 21321121223103 is 30132212112312.

It is a de Polignac number, because none of the positive numbers 2^k-21321121223103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321121223123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10078275 + ... + 12008907.

It is an arithmetic number, because the mean of its divisors is an integer number (1013055786918).

Almost surely, 2^{21321121223103} is an apocalyptic number.

21321121223103 is a deficient number, since it is larger than the sum of its proper divisors (11096663958273).

21321121223103 is a wasteful number, since it uses less digits than its factorization.

21321121223103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1947323.

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 21321121223103 its reverse (30132212112312), we get a palindrome (51453333335415).

The spelling of 21321121223103 in words is "twenty-one trillion, three hundred twenty-one billion, one hundred twenty-one million, two hundred twenty-three thousand, one hundred three".