21121201103 has 12 divisors (see below), whose sum is σ = 21363064440. Its totient is φ = 20882032800.

The previous prime is 21121201099. The next prime is 21121201109. The reversal of 21121201103 is 30110212112.

It is not a de Polignac number, because 21121201103 - 2² = 21121201099 is a prime.

It is a super-2 number, since 2×21121201103² (a number of 21 digits) contains 22 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 (21121201109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11311976 + ... + 11313842.

It is an arithmetic number, because the mean of its divisors is an integer number (1780255370).

Almost surely, 2^21121201103 is an apocalyptic number.

21121201103 is a deficient number, since it is larger than the sum of its proper divisors (241863337).

21121201103 is a wasteful number, since it uses less digits than its factorization.

21121201103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3178 (or 3077 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21121201103 its reverse (30110212112), we get a palindrome (51231413215).

The spelling of 21121201103 in words is "twenty-one billion, one hundred twenty-one million, two hundred one thousand, one hundred three".