20021221133 has 8 divisors (see below), whose sum is σ = 20669045760. Its totient is φ = 19373520240.

The previous prime is 20021221127. The next prime is 20021221159. The reversal of 20021221133 is 33112212002.

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 20021221133 - 2¹² = 20021217037 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 (20021220133) 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, 388316 + ... + 436842.

It is an arithmetic number, because the mean of its divisors is an integer number (2583630720).

Almost surely, 2^20021221133 is an apocalyptic number.

It is an amenable number.

20021221133 is a deficient number, since it is larger than the sum of its proper divisors (647824627).

20021221133 is a wasteful number, since it uses less digits than its factorization.

20021221133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61867.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20021221133 its reverse (33112212002), we get a palindrome (53133433135).

The spelling of 20021221133 in words is "twenty billion, twenty-one million, two hundred twenty-one thousand, one hundred thirty-three".