20213221212133 has 4 divisors (see below), whose sum is σ = 21277074960160. Its totient is φ = 19149367464108.

The previous prime is 20213221212127. The next prime is 20213221212193. The reversal of 20213221212133 is 33121212231202.

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 a de Polignac number, because none of the positive numbers 2^k-20213221212133 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20213221212098 and 20213221212107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20213221212193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 531926873985 + ... + 531926874022.

It is an arithmetic number, because the mean of its divisors is an integer number (5319268740040).

Almost surely, 2^{20213221212133} is an apocalyptic number.

It is an amenable number.

20213221212133 is a deficient number, since it is larger than the sum of its proper divisors (1063853748027).

20213221212133 is a wasteful number, since it uses less digits than its factorization.

20213221212133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063853748026.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 20213221212133 its reverse (33121212231202), we get a palindrome (53334433443335).

The spelling of 20213221212133 in words is "twenty trillion, two hundred thirteen billion, two hundred twenty-one million, two hundred twelve thousand, one hundred thirty-three".