21011221022103 has 32 divisors (see below), whose sum is σ = 33560400171200. Its totient is φ = 12915238555008.

The previous prime is 21011221022093. The next prime is 21011221022111. The reversal of 21011221022103 is 30122012211012.

21011221022103 is a `hidden beast` number, since 210 + 11 + 221 + 0 + 221 + 0 + 3 = 666.

It is not a de Polignac number, because 21011221022103 - 2⁴ = 21011221022087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011221022503) 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, 33820468 + ... + 34436121.

It is an arithmetic number, because the mean of its divisors is an integer number (1048762505350).

Almost surely, 2^{21011221022103} is an apocalyptic number.

21011221022103 is a deficient number, since it is larger than the sum of its proper divisors (12549179149097).

21011221022103 is a wasteful number, since it uses less digits than its factorization.

21011221022103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68257488 (or 68257482 counting only the distinct ones).

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

Adding to 21011221022103 its reverse (30122012211012), we get a palindrome (51133233233115).

The spelling of 21011221022103 in words is "twenty-one trillion, eleven billion, two hundred twenty-one million, twenty-two thousand, one hundred three".