21202231121121 has 64 divisors (see below), whose sum is σ = 29714073804800. Its totient is φ = 13430657433600.

The previous prime is 21202231121081. The next prime is 21202231121153. The reversal of 21202231121121 is 12112113220212.

It is not a de Polignac number, because 21202231121121 - 2³⁴ = 21185051251937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21202231126121) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2592272610 + ... + 2592280788.

It is an arithmetic number, because the mean of its divisors is an integer number (464282403200).

Almost surely, 2^{21202231121121} is an apocalyptic number.

It is an amenable number.

21202231121121 is a deficient number, since it is larger than the sum of its proper divisors (8511842683679).

21202231121121 is a wasteful number, since it uses less digits than its factorization.

21202231121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9590.

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 21202231121121 its reverse (12112113220212), we get a palindrome (33314344341333).

The spelling of 21202231121121 in words is "twenty-one trillion, two hundred two billion, two hundred thirty-one million, one hundred twenty-one thousand, one hundred twenty-one".