21212303030103 has 4 divisors (see below), whose sum is σ = 28283070706808. Its totient is φ = 14141535353400.

The previous prime is 21212303030089. The next prime is 21212303030129. The reversal of 21212303030103 is 30103030321212.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-21212303030103 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21212303030103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212303030903) 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, 3535383838348 + ... + 3535383838353.

It is an arithmetic number, because the mean of its divisors is an integer number (7070767676702).

Almost surely, 2^{21212303030103} is an apocalyptic number.

21212303030103 is a deficient number, since it is larger than the sum of its proper divisors (7070767676705).

21212303030103 is an equidigital number, since it uses as much as digits as its factorization.

21212303030103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7070767676704.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21212303030103 its reverse (30103030321212), we get a palindrome (51315333351315).

The spelling of 21212303030103 in words is "twenty-one trillion, two hundred twelve billion, three hundred three million, thirty thousand, one hundred three".