20021101211 has 16 divisors (see below), whose sum is σ = 21385762560. Its totient is φ = 18687886560.

The previous prime is 20021101207. The next prime is 20021101237. The reversal of 20021101211 is 11210112002.

It is a cyclic number.

It is not a de Polignac number, because 20021101211 - 2² = 20021101207 is a prime.

It is a super-2 number, since 2×20021101211² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021101192 and 20021101201.

It is not an unprimeable number, because it can be changed into a prime (20021101271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2528120 + ... + 2536026.

It is an arithmetic number, because the mean of its divisors is an integer number (1336610160).

Almost surely, 2^20021101211 is an apocalyptic number.

20021101211 is a deficient number, since it is larger than the sum of its proper divisors (1364661349).

20021101211 is a wasteful number, since it uses less digits than its factorization.

20021101211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9874.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20021101211 its reverse (11210112002), we get a palindrome (31231213213).

The spelling of 20021101211 in words is "twenty billion, twenty-one million, one hundred one thousand, two hundred eleven".