21101733 has 12 divisors (see below), whose sum is σ = 30751500. Its totient is φ = 13942656.

The previous prime is 21101701. The next prime is 21101737. The reversal of 21101733 is 33710112.

It can be written as a sum of positive squares in 2 ways, for example, as 471969 + 20629764 = 687^2 + 4542^2 .

It is not a de Polignac number, because 21101733 - 2⁵ = 21101701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9358 + ... + 11391.

It is an arithmetic number, because the mean of its divisors is an integer number (2562625).

Almost surely, 2^21101733 is an apocalyptic number.

It is an amenable number.

21101733 is a deficient number, since it is larger than the sum of its proper divisors (9649767).

21101733 is a wasteful number, since it uses less digits than its factorization.

21101733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20868 (or 20865 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 18.

The square root of 21101733 is about 4593.6622644683. The cubic root of 21101733 is about 276.3372138519.

Adding to 21101733 its reverse (33710112), we get a palindrome (54811845).

The spelling of 21101733 in words is "twenty-one million, one hundred one thousand, seven hundred thirty-three".