20021103211 has 4 divisors (see below), whose sum is σ = 20036192032. Its totient is φ = 20006014392.

The previous prime is 20021103173. The next prime is 20021103239. The reversal of 20021103211 is 11230112002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11230112002 = 2 ⋅5615056001.

It is a cyclic number.

It is not a de Polignac number, because 20021103211 - 2⁷ = 20021103083 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021103191 and 20021103200.

It is not an unprimeable number, because it can be changed into a prime (20021104211) 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, 7542420 + ... + 7545073.

It is an arithmetic number, because the mean of its divisors is an integer number (5009048008).

Almost surely, 2^20021103211 is an apocalyptic number.

20021103211 is a deficient number, since it is larger than the sum of its proper divisors (15088821).

20021103211 is a wasteful number, since it uses less digits than its factorization.

20021103211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15088820.

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

Adding to 20021103211 its reverse (11230112002), we get a palindrome (31251215213).

The spelling of 20021103211 in words is "twenty billion, twenty-one million, one hundred three thousand, two hundred eleven".