20021115311 has 2 divisors, whose sum is σ = 20021115312. Its totient is φ = 20021115310.

The previous prime is 20021115307. The next prime is 20021115349. The reversal of 20021115311 is 11351112002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20021115311 - 2² = 20021115307 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20021115311.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20021115391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010557655 + 10010557656.

It is an arithmetic number, because the mean of its divisors is an integer number (10010557656).

Almost surely, 2^20021115311 is an apocalyptic number.

20021115311 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021115311 is an equidigital number, since it uses as much as digits as its factorization.

20021115311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60, while the sum is 17.

Adding to 20021115311 its reverse (11351112002), we get a palindrome (31372227313).

The spelling of 20021115311 in words is "twenty billion, twenty-one million, one hundred fifteen thousand, three hundred eleven".