21122211110 has 128 divisors (see below), whose sum is σ = 51147307008. Its totient is φ = 6065280000.

The previous prime is 21122211107. The next prime is 21122211157. The reversal of 21122211110 is 1111222112.

It is a super-2 number, since 2×21122211110² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6014255 + ... + 6017765.

It is an arithmetic number, because the mean of its divisors is an integer number (399588336).

Almost surely, 2^21122211110 is an apocalyptic number.

21122211110 is an abundant number, since it is smaller than the sum of its proper divisors (30025095898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21122211110 is a wasteful number, since it uses less digits than its factorization.

21122211110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4150.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21122211110 its reverse (1111222112), we get a palindrome (22233433222).

It can be divided in two parts, 21122 and 211110, that added together give a palindrome (232232).

The spelling of 21122211110 in words is "twenty-one billion, one hundred twenty-two million, two hundred eleven thousand, one hundred ten".