20211022011 has 4 divisors (see below), whose sum is σ = 26948029352. Its totient is φ = 13474014672.

The previous prime is 20211021991. The next prime is 20211022021. The reversal of 20211022011 is 11022011202.

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

It is not a de Polignac number, because 20211022011 - 2¹⁷ = 20210890939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20211022021) 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, 3368503666 + ... + 3368503671.

It is an arithmetic number, because the mean of its divisors is an integer number (6737007338).

Almost surely, 2^20211022011 is an apocalyptic number.

20211022011 is a deficient number, since it is larger than the sum of its proper divisors (6737007341).

20211022011 is an equidigital number, since it uses as much as digits as its factorization.

20211022011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6737007340.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20211022011 its reverse (11022011202), we get a palindrome (31233033213).

It can be divided in two parts, 202 and 11022011, that multiplied together give a palindrome (2226446222).

The spelling of 20211022011 in words is "twenty billion, two hundred eleven million, twenty-two thousand, eleven".