21023211103 has 4 divisors (see below), whose sum is σ = 21026175480. Its totient is φ = 21020246728.

The previous prime is 21023211091. The next prime is 21023211149. The reversal of 21023211103 is 30111232012.

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 21023211103 - 2¹³ = 21023202911 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 (21023212103) 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, 1471525 + ... + 1485742.

It is an arithmetic number, because the mean of its divisors is an integer number (5256543870).

Almost surely, 2^21023211103 is an apocalyptic number.

21023211103 is a deficient number, since it is larger than the sum of its proper divisors (2964377).

21023211103 is an equidigital number, since it uses as much as digits as its factorization.

21023211103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2964376.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21023211103 its reverse (30111232012), we get a palindrome (51134443115).

The spelling of 21023211103 in words is "twenty-one billion, twenty-three million, two hundred eleven thousand, one hundred three".