21022122011 has 16 divisors (see below), whose sum is σ = 24112965600. Its totient is φ = 18149510400.

The previous prime is 21022122007. The next prime is 21022122013. The reversal of 21022122011 is 11022122012.

It is a cyclic number.

It is not a de Polignac number, because 21022122011 - 2² = 21022122007 is a prime.

It is a super-2 number, since 2×21022122011² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21022122013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 520706 + ... + 559623.

It is an arithmetic number, because the mean of its divisors is an integer number (1507060350).

Almost surely, 2^21022122011 is an apocalyptic number.

21022122011 is a deficient number, since it is larger than the sum of its proper divisors (3090843589).

21022122011 is a wasteful number, since it uses less digits than its factorization.

21022122011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080430.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21022122011 its reverse (11022122012), we get a palindrome (32044244023).

Subtracting from 21022122011 its reverse (11022122012), we obtain a palindrome (9999999999).

It can be divided in two parts, 210221 and 22011, that added together give a palindrome (232232).

The spelling of 21022122011 in words is "twenty-one billion, twenty-two million, one hundred twenty-two thousand, eleven".