20211133021 has 4 divisors (see below), whose sum is σ = 20212375392. Its totient is φ = 20209890652.

The previous prime is 20211132971. The next prime is 20211133031. The reversal of 20211133021 is 12033111202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20211133021 - 2¹⁷ = 20211001949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20211132986 and 20211133004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211133031) 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, 596455 + ... + 629428.

It is an arithmetic number, because the mean of its divisors is an integer number (5053093848).

Almost surely, 2^20211133021 is an apocalyptic number.

It is an amenable number.

20211133021 is a deficient number, since it is larger than the sum of its proper divisors (1242371).

20211133021 is a wasteful number, since it uses less digits than its factorization.

20211133021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242370.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 20211133021 its reverse (12033111202), we get a palindrome (32244244223).

The spelling of 20211133021 in words is "twenty billion, two hundred eleven million, one hundred thirty-three thousand, twenty-one".