21021101111103 has 16 divisors (see below), whose sum is σ = 28626228673536. Its totient is φ = 13715056948320.

The previous prime is 21021101111069. The next prime is 21021101111107. The reversal of 21021101111103 is 30111110112012.

It is not a de Polignac number, because 21021101111103 - 2⁶ = 21021101111039 is a prime.

It is a super-2 number, since 2×21021101111103² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021101111107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2240851 + ... + 6860292.

It is an arithmetic number, because the mean of its divisors is an integer number (1789139292096).

Almost surely, 2^{21021101111103} is an apocalyptic number.

21021101111103 is a deficient number, since it is larger than the sum of its proper divisors (7605127562433).

21021101111103 is a wasteful number, since it uses less digits than its factorization.

21021101111103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9117574.

The product of its (nonzero) digits is 12, while the sum is 15.

Adding to 21021101111103 its reverse (30111110112012), we get a palindrome (51132211223115).

Subtracting 21021101111103 from its reverse (30111110112012), we obtain a palindrome (9090009000909).

The spelling of 21021101111103 in words is "twenty-one trillion, twenty-one billion, one hundred one million, one hundred eleven thousand, one hundred three".