21210100133 has 8 divisors (see below), whose sum is σ = 22459028760. Its totient is φ = 19961313280.

The previous prime is 21210100117. The next prime is 21210100139. The reversal of 21210100133 is 33100101212.

It can be written as a sum of positive squares in 4 ways, for example, as 12769452004 + 8440648129 = 113002^2 + 91873^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21210100133 - 2⁴ = 21210100117 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 (21210100139) 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, 535223 + ... + 573483.

It is an arithmetic number, because the mean of its divisors is an integer number (2807378595).

Almost surely, 2^21210100133 is an apocalyptic number.

It is an amenable number.

21210100133 is a deficient number, since it is larger than the sum of its proper divisors (1248928627).

21210100133 is a wasteful number, since it uses less digits than its factorization.

21210100133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70887.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21210100133 its reverse (33100101212), we get a palindrome (54310201345).

The spelling of 21210100133 in words is "twenty-one billion, two hundred ten million, one hundred thousand, one hundred thirty-three".