21013321022121 has 16 divisors (see below), whose sum is σ = 28052080721280. Its totient is φ = 13991722106880.

The previous prime is 21013321022117. The next prime is 21013321022167. The reversal of 21013321022121 is 12122012331012.

It is not a de Polignac number, because 21013321022121 - 2² = 21013321022117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21013321022101) 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, 87201961 + ... + 87442601.

It is an arithmetic number, because the mean of its divisors is an integer number (1753255045080).

Almost surely, 2^{21013321022121} is an apocalyptic number.

It is an amenable number.

21013321022121 is a deficient number, since it is larger than the sum of its proper divisors (7038759699159).

21013321022121 is a wasteful number, since it uses less digits than its factorization.

21013321022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276176.

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

Adding to 21013321022121 its reverse (12122012331012), we get a palindrome (33135333353133).

The spelling of 21013321022121 in words is "twenty-one trillion, thirteen billion, three hundred twenty-one million, twenty-two thousand, one hundred twenty-one".