21122001121 has 8 divisors (see below), whose sum is σ = 23132309760. Its totient is φ = 19166769552.

The previous prime is 21122001071. The next prime is 21122001139. The reversal of 21122001121 is 12110022112.

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

It is a cyclic number.

It is not a de Polignac number, because 21122001121 - 2²⁵ = 21088446689 is a prime.

It is a super-2 number, since 2×21122001121² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21122001151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13768465 + ... + 13769998.

It is an arithmetic number, because the mean of its divisors is an integer number (2891538720).

Almost surely, 2^21122001121 is an apocalyptic number.

It is an amenable number.

21122001121 is a deficient number, since it is larger than the sum of its proper divisors (2010308639).

21122001121 is a wasteful number, since it uses less digits than its factorization.

21122001121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27538535.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21122001121 its reverse (12110022112), we get a palindrome (33232023233).

The spelling of 21122001121 in words is "twenty-one billion, one hundred twenty-two million, one thousand, one hundred twenty-one".