21001111111122 has 16 divisors (see below), whose sum is σ = 42009692007360. Its totient is φ = 6999125406192.

The previous prime is 21001111111103. The next prime is 21001111111229. The reversal of 21001111111122 is 22111111110012.

It is a super-3 number, since 3×21001111111122³ (a number of 41 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 311204497 + ... + 311271972.

It is an arithmetic number, because the mean of its divisors is an integer number (2625605750460).

Almost surely, 2^{21001111111122} is an apocalyptic number.

21001111111122 is an abundant number, since it is smaller than the sum of its proper divisors (21008580896238).

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

21001111111122 is a wasteful number, since it uses less digits than its factorization.

21001111111122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622482097.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 21001111111122 its reverse (22111111110012), we get a palindrome (43112222221134).

The spelling of 21001111111122 in words is "twenty-one trillion, one billion, one hundred eleven million, one hundred eleven thousand, one hundred twenty-two".