20021233 has 2 divisors, whose sum is σ = 20021234. Its totient is φ = 20021232.

The previous prime is 20021213. The next prime is 20021251. The reversal of 20021233 is 33212002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13198689 + 6822544 = 3633^2 + 2612^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021233 - 2¹⁷ = 19890161 is a prime.

It is not a weakly prime, because it can be changed into another prime (20021203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010616 + 10010617.

It is an arithmetic number, because the mean of its divisors is an integer number (10010617).

Almost surely, 2^20021233 is an apocalyptic number.

It is an amenable number.

20021233 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021233 is an equidigital number, since it uses as much as digits as its factorization.

20021233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 20021233 is about 4474.5092468337. The cubic root of 20021233 is about 271.5377864014.

Adding to 20021233 its reverse (33212002), we get a palindrome (53233235).

The spelling of 20021233 in words is "twenty million, twenty-one thousand, two hundred thirty-three".