21001022133 has 64 divisors (see below), whose sum is σ = 35934044160. Its totient is φ = 10610756352.

The previous prime is 21001022071. The next prime is 21001022209. The reversal of 21001022133 is 33122010012.

It is not a de Polignac number, because 21001022133 - 2²⁹ = 20464151221 is a prime.

It is a super-3 number, since 3×21001022133³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001022033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 995016 + ... + 1015902.

It is an arithmetic number, because the mean of its divisors is an integer number (561469440).

Almost surely, 2^21001022133 is an apocalyptic number.

It is an amenable number.

21001022133 is a deficient number, since it is larger than the sum of its proper divisors (14933022027).

21001022133 is a wasteful number, since it uses less digits than its factorization.

21001022133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21066.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21001022133 its reverse (33122010012), we get a palindrome (54123032145).

The spelling of 21001022133 in words is "twenty-one billion, one million, twenty-two thousand, one hundred thirty-three".