21202311212103 has 8 divisors (see below), whose sum is σ = 32308283751808. Its totient is φ = 12115606406904.

The previous prime is 21202311212059. The next prime is 21202311212107. The reversal of 21202311212103 is 30121211320212.

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

It is a de Polignac number, because none of the positive numbers 2^k-21202311212103 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 1009633867243 = 21202311212103 / (2 + 1 + 2 + 0 + 2 + 3 + 1 + 1 + 2 + 1 + 2 + 1 + 0 + 3).

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 21202311212103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202311212107) 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, 504816933601 + ... + 504816933642.

It is an arithmetic number, because the mean of its divisors is an integer number (4038535468976).

Almost surely, 2^{21202311212103} is an apocalyptic number.

21202311212103 is a deficient number, since it is larger than the sum of its proper divisors (11105972539705).

21202311212103 is a wasteful number, since it uses less digits than its factorization.

21202311212103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009633867253.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21202311212103 its reverse (30121211320212), we get a palindrome (51323522532315).

The spelling of 21202311212103 in words is "twenty-one trillion, two hundred two billion, three hundred eleven million, two hundred twelve thousand, one hundred three".