21022422011 has 4 divisors (see below), whose sum is σ = 21069243000. Its totient is φ = 20975601024.

The previous prime is 21022421999. The next prime is 21022422203. The reversal of 21022422011 is 11022422012.

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 21022422011 - 2⁶ = 21022421947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21022472011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23409821 + ... + 23410718.

It is an arithmetic number, because the mean of its divisors is an integer number (5267310750).

Almost surely, 2^21022422011 is an apocalyptic number.

21022422011 is a deficient number, since it is larger than the sum of its proper divisors (46820989).

21022422011 is an equidigital number, since it uses as much as digits as its factorization.

21022422011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46820988.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21022422011 its reverse (11022422012), we get a palindrome (32044844023).

Subtracting from 21022422011 its reverse (11022422012), we obtain a palindrome (9999999999).

The spelling of 21022422011 in words is "twenty-one billion, twenty-two million, four hundred twenty-two thousand, eleven".