21231111201121 has 4 divisors (see below), whose sum is σ = 21231215694000. Its totient is φ = 21231006708244.

The previous prime is 21231111201103. The next prime is 21231111201143. The reversal of 21231111201121 is 12110211113212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21231111201121 - 2⁷ = 21231111200993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21231111201101) 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, 51941071 + ... + 52348228.

It is an arithmetic number, because the mean of its divisors is an integer number (5307803923500).

Almost surely, 2^{21231111201121} is an apocalyptic number.

It is an amenable number.

21231111201121 is a deficient number, since it is larger than the sum of its proper divisors (104492879).

21231111201121 is a wasteful number, since it uses less digits than its factorization.

21231111201121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104492878.

The product of its (nonzero) digits is 48, while the sum is 19.

Adding to 21231111201121 its reverse (12110211113212), we get a palindrome (33341322314333).

The spelling of 21231111201121 in words is "twenty-one trillion, two hundred thirty-one billion, one hundred eleven million, two hundred one thousand, one hundred twenty-one".