20021133133 has 4 divisors (see below), whose sum is σ = 20025294300. Its totient is φ = 20016971968.

The previous prime is 20021133109. The next prime is 20021133191. The reversal of 20021133133 is 33133112002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33133112002 = 2 ⋅16566556001.

It can be written as a sum of positive squares in 2 ways, for example, as 8700598729 + 11320534404 = 93277^2 + 106398^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20021133133 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20021133133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021133103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2073358 + ... + 2082991.

It is an arithmetic number, because the mean of its divisors is an integer number (5006323575).

Almost surely, 2^20021133133 is an apocalyptic number.

It is an amenable number.

20021133133 is a deficient number, since it is larger than the sum of its proper divisors (4161167).

20021133133 is an equidigital number, since it uses as much as digits as its factorization.

20021133133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4161166.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 20021133133 its reverse (33133112002), we get a palindrome (53154245135).

The spelling of 20021133133 in words is "twenty billion, twenty-one million, one hundred thirty-three thousand, one hundred thirty-three".