21223113121 has 16 divisors (see below), whose sum is σ = 24622345600. Its totient is φ = 17916432768.

The previous prime is 21223113103. The next prime is 21223113139. The reversal of 21223113121 is 12131132212.

It is an interprime number because it is at equal distance from previous prime (21223113103) and next prime (21223113139).

It is a cyclic number.

It is not a de Polignac number, because 21223113121 - 2²⁷ = 21088895393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21223113101) 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 15 ways as a sum of consecutive naturals, for example, 333010 + ... + 391588.

It is an arithmetic number, because the mean of its divisors is an integer number (1538896600).

Almost surely, 2^21223113121 is an apocalyptic number.

It is an amenable number.

21223113121 is a deficient number, since it is larger than the sum of its proper divisors (3399232479).

21223113121 is an equidigital number, since it uses as much as digits as its factorization.

21223113121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59368.

The product of its digits is 144, while the sum is 19.

Adding to 21223113121 its reverse (12131132212), we get a palindrome (33354245333).

The spelling of 21223113121 in words is "twenty-one billion, two hundred twenty-three million, one hundred thirteen thousand, one hundred twenty-one".