20021001223 has 4 divisors (see below), whose sum is σ = 20509318368. Its totient is φ = 19532684080.

The previous prime is 20021001193. The next prime is 20021001229. The reversal of 20021001223 is 32210012002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20021001223 - 2⁵ = 20021001191 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 (20021001229) 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, 244158511 + ... + 244158592.

It is an arithmetic number, because the mean of its divisors is an integer number (5127329592).

Almost surely, 2^20021001223 is an apocalyptic number.

20021001223 is a deficient number, since it is larger than the sum of its proper divisors (488317145).

20021001223 is an equidigital number, since it uses as much as digits as its factorization.

20021001223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488317144.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 20021001223 its reverse (32210012002), we get a palindrome (52231013225).

The spelling of 20021001223 in words is "twenty billion, twenty-one million, one thousand, two hundred twenty-three".