20021231011 has 2 divisors, whose sum is σ = 20021231012. Its totient is φ = 20021231010.

The previous prime is 20021230979. The next prime is 20021231023. The reversal of 20021231011 is 11013212002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20021231011 - 2⁵ = 20021230979 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20021230982 and 20021231000.

It is not a weakly prime, because it can be changed into another prime (20021231311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010615505 + 10010615506.

It is an arithmetic number, because the mean of its divisors is an integer number (10010615506).

Almost surely, 2^20021231011 is an apocalyptic number.

20021231011 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021231011 is an equidigital number, since it uses as much as digits as its factorization.

20021231011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 20021231011 its reverse (11013212002), we get a palindrome (31034443013).

The spelling of 20021231011 in words is "twenty billion, twenty-one million, two hundred thirty-one thousand, eleven".