21101011133 has 8 divisors (see below), whose sum is σ = 22344594552. Its totient is φ = 19857688576.

The previous prime is 21101011103. The next prime is 21101011147. The reversal of 21101011133 is 33111010112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6533003929 + 14568007204 = 80827^2 + 120698^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21101011133 - 2⁸ = 21101010877 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 (21101011103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115691 + ... + 235767.

It is an arithmetic number, because the mean of its divisors is an integer number (2793074319).

Almost surely, 2^21101011133 is an apocalyptic number.

It is an amenable number.

21101011133 is a deficient number, since it is larger than the sum of its proper divisors (1243583419).

21101011133 is a wasteful number, since it uses less digits than its factorization.

21101011133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130431.

The product of its (nonzero) digits is 18, while the sum is 14.

Adding to 21101011133 its reverse (33111010112), we get a palindrome (54212021245).

The spelling of 21101011133 in words is "twenty-one billion, one hundred one million, eleven thousand, one hundred thirty-three".