21001122111122 has 8 divisors (see below), whose sum is σ = 31526704364400. Its totient is φ = 10492220656324.

The previous prime is 21001122111113. The next prime is 21001122111127. The reversal of 21001122111122 is 22111122110012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21001122111122.

It is not an unprimeable number, because it can be changed into a prime (21001122111127) 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, 4170196472 + ... + 4170201507.

It is an arithmetic number, because the mean of its divisors is an integer number (3940838045550).

Almost surely, 2^{21001122111122} is an apocalyptic number.

21001122111122 is a deficient number, since it is larger than the sum of its proper divisors (10525582253278).

21001122111122 is a wasteful number, since it uses less digits than its factorization.

21001122111122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8340399240.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21001122111122 its reverse (22111122110012), we get a palindrome (43112244221134).

The spelling of 21001122111122 in words is "twenty-one trillion, one billion, one hundred twenty-two million, one hundred eleven thousand, one hundred twenty-two".