21221101202103 has 32 divisors (see below), whose sum is σ = 34470824382720. Its totient is φ = 12795987768480.

The previous prime is 21221101202089. The next prime is 21221101202219. The reversal of 21221101202103 is 30120210112212.

It is not a de Polignac number, because 21221101202103 - 2¹⁷ = 21221101071031 is a prime.

It is a super-3 number, since 3×21221101202103³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221101202603) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 181290525 + ... + 181407542.

It is an arithmetic number, because the mean of its divisors is an integer number (1077213261960).

Almost surely, 2^{21221101202103} is an apocalyptic number.

21221101202103 is a deficient number, since it is larger than the sum of its proper divisors (13249723180617).

21221101202103 is a wasteful number, since it uses less digits than its factorization.

21221101202103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362698284 (or 362698278 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21221101202103 its reverse (30120210112212), we get a palindrome (51341311314315).

The spelling of 21221101202103 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred one million, two hundred two thousand, one hundred three".