20021223311 has 2 divisors, whose sum is σ = 20021223312. Its totient is φ = 20021223310.

The previous prime is 20021223307. The next prime is 20021223317. The reversal of 20021223311 is 11332212002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20021223311 - 2² = 20021223307 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20021223311.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20021223317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010611655 + 10010611656.

It is an arithmetic number, because the mean of its divisors is an integer number (10010611656).

Almost surely, 2^20021223311 is an apocalyptic number.

20021223311 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021223311 is an equidigital number, since it uses as much as digits as its factorization.

20021223311 is an odious number, because the sum of its binary digits is odd.

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

Adding to 20021223311 its reverse (11332212002), we get a palindrome (31353435313).

The spelling of 20021223311 in words is "twenty billion, twenty-one million, two hundred twenty-three thousand, three hundred eleven".