20021022211 has 4 divisors (see below), whose sum is σ = 20061145000. Its totient is φ = 19980899424.

The previous prime is 20021022173. The next prime is 20021022223. The reversal of 20021022211 is 11222012002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11222012002 = 2 ⋅5611006001.

It is a cyclic number.

It is not a de Polignac number, because 20021022211 - 2²³ = 20012633603 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021022191 and 20021022200.

It is not an unprimeable number, because it can be changed into a prime (20021022251) 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, 20060646 + ... + 20061643.

It is an arithmetic number, because the mean of its divisors is an integer number (5015286250).

Almost surely, 2^20021022211 is an apocalyptic number.

20021022211 is a deficient number, since it is larger than the sum of its proper divisors (40122789).

20021022211 is an equidigital number, since it uses as much as digits as its factorization.

20021022211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40122788.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20021022211 its reverse (11222012002), we get a palindrome (31243034213).

The spelling of 20021022211 in words is "twenty billion, twenty-one million, twenty-two thousand, two hundred eleven".