21112020332121 has 16 divisors (see below), whose sum is σ = 28257063284736. Its totient is φ = 14020831343376.

The previous prime is 21112020332119. The next prime is 21112020332129. The reversal of 21112020332121 is 12123302021112.

It is not a de Polignac number, because 21112020332121 - 2¹ = 21112020332119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21112020332129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35480566 + ... + 36070688.

It is an arithmetic number, because the mean of its divisors is an integer number (1766066455296).

Almost surely, 2^{21112020332121} is an apocalyptic number.

It is an amenable number.

21112020332121 is a deficient number, since it is larger than the sum of its proper divisors (7145042952615).

21112020332121 is a wasteful number, since it uses less digits than its factorization.

21112020332121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635732.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21112020332121 its reverse (12123302021112), we get a palindrome (33235322353233).

The spelling of 21112020332121 in words is "twenty-one trillion, one hundred twelve billion, twenty million, three hundred thirty-two thousand, one hundred twenty-one".