21101111133 has 16 divisors (see below), whose sum is σ = 28394862336. Its totient is φ = 13937780480.

The previous prime is 21101111113. The next prime is 21101111149. The reversal of 21101111133 is 33111110112.

It is a cyclic number.

It is not a de Polignac number, because 21101111133 - 2¹² = 21101107037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101111113) 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, 164860 + ... + 263402.

It is an arithmetic number, because the mean of its divisors is an integer number (1774678896).

Almost surely, 2^21101111133 is an apocalyptic number.

It is an amenable number.

21101111133 is a deficient number, since it is larger than the sum of its proper divisors (7293751203).

21101111133 is a wasteful number, since it uses less digits than its factorization.

21101111133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99204.

The product of its (nonzero) digits is 18, while the sum is 15.

Adding to 21101111133 its reverse (33111110112), we get a palindrome (54212221245).

The spelling of 21101111133 in words is "twenty-one billion, one hundred one million, one hundred eleven thousand, one hundred thirty-three".