20021211102211 has 4 divisors (see below), whose sum is σ = 21841321202424. Its totient is φ = 18201101002000.

The previous prime is 20021211102209. The next prime is 20021211102241. The reversal of 20021211102211 is 11220111212002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20021211102211 - 2¹ = 20021211102209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021211102241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 910055050090 + ... + 910055050111.

It is an arithmetic number, because the mean of its divisors is an integer number (5460330300606).

Almost surely, 2^{20021211102211} is an apocalyptic number.

20021211102211 is a deficient number, since it is larger than the sum of its proper divisors (1820110100213).

20021211102211 is a wasteful number, since it uses less digits than its factorization.

20021211102211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1820110100212.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20021211102211 its reverse (11220111212002), we get a palindrome (31241322314213).

The spelling of 20021211102211 in words is "twenty trillion, twenty-one billion, two hundred eleven million, one hundred two thousand, two hundred eleven".