20021102311 has 4 divisors (see below), whose sum is σ = 22881259792. Its totient is φ = 17160944832.

The previous prime is 20021102221. The next prime is 20021102327. The reversal of 20021102311 is 11320112002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11320112002 = 2 ⋅5660056001.

It is a cyclic number.

It is not a de Polignac number, because 20021102311 - 2⁷ = 20021102183 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021102291 and 20021102300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021105311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1430078730 + ... + 1430078743.

It is an arithmetic number, because the mean of its divisors is an integer number (5720314948).

Almost surely, 2^20021102311 is an apocalyptic number.

20021102311 is a deficient number, since it is larger than the sum of its proper divisors (2860157481).

20021102311 is an equidigital number, since it uses as much as digits as its factorization.

20021102311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2860157480.

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

Adding to 20021102311 its reverse (11320112002), we get a palindrome (31341214313).

The spelling of 20021102311 in words is "twenty billion, twenty-one million, one hundred two thousand, three hundred eleven".