21453212103 has 8 divisors (see below), whose sum is σ = 28925679600. Its totient is φ = 14141443008.

The previous prime is 21453212089. The next prime is 21453212147. The reversal of 21453212103 is 30121235412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21453212103 - 2¹³ = 21453203911 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21453212153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40174288 + ... + 40174821.

It is an arithmetic number, because the mean of its divisors is an integer number (3615709950).

Almost surely, 2^21453212103 is an apocalyptic number.

21453212103 is a deficient number, since it is larger than the sum of its proper divisors (7472467497).

21453212103 is an equidigital number, since it uses as much as digits as its factorization.

21453212103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80349201.

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 21453212103 its reverse (30121235412), we get a palindrome (51574447515).

The spelling of 21453212103 in words is "twenty-one billion, four hundred fifty-three million, two hundred twelve thousand, one hundred three".