21202212103 has 4 divisors (see below), whose sum is σ = 21210134920. Its totient is φ = 21194289288.

The previous prime is 21202212071. The next prime is 21202212113. The reversal of 21202212103 is 30121220212.

It is a happy number.

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 21202212103 - 2⁵ = 21202212071 is a prime.

It is a super-3 number, since 3×21202212103³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202212113) 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, 3957393 + ... + 3962746.

It is an arithmetic number, because the mean of its divisors is an integer number (5302533730).

Almost surely, 2^21202212103 is an apocalyptic number.

21202212103 is a deficient number, since it is larger than the sum of its proper divisors (7922817).

21202212103 is an equidigital number, since it uses as much as digits as its factorization.

21202212103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7922816.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21202212103 its reverse (30121220212), we get a palindrome (51323432315).

The spelling of 21202212103 in words is "twenty-one billion, two hundred two million, two hundred twelve thousand, one hundred three".