21022111121 has 8 divisors (see below), whose sum is σ = 22934316000. Its totient is φ = 19110090240.

The previous prime is 21022111111. The next prime is 21022111163. The reversal of 21022111121 is 12111122012.

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 21022111121 - 2⁶ = 21022111057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21022111096 and 21022111105.

It is not an unprimeable number, because it can be changed into a prime (21022111111) 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, 318545 + ... + 378833.

It is an arithmetic number, because the mean of its divisors is an integer number (2866789500).

Almost surely, 2^21022111121 is an apocalyptic number.

It is an amenable number.

21022111121 is a deficient number, since it is larger than the sum of its proper divisors (1912204879).

21022111121 is a wasteful number, since it uses less digits than its factorization.

21022111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91999.

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

Adding to 21022111121 its reverse (12111122012), we get a palindrome (33133233133).

The spelling of 21022111121 in words is "twenty-one billion, twenty-two million, one hundred eleven thousand, one hundred twenty-one".