21140445301121 has 4 divisors (see below), whose sum is σ = 21282327484500. Its totient is φ = 20998563117744.

The previous prime is 21140445301109. The next prime is 21140445301153. The reversal of 21140445301121 is 12110354404112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11306977882225 + 9833467418896 = 3362585^2 + 3135836^2 .

It is a cyclic number.

It is not a de Polignac number, because 21140445301121 - 2¹⁰ = 21140445300097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21140445301621) 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, 70941091466 + ... + 70941091763.

It is an arithmetic number, because the mean of its divisors is an integer number (5320581871125).

Almost surely, 2^{21140445301121} is an apocalyptic number.

It is an amenable number.

21140445301121 is a deficient number, since it is larger than the sum of its proper divisors (141882183379).

21140445301121 is a wasteful number, since it uses less digits than its factorization.

21140445301121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141882183378.

The product of its (nonzero) digits is 3840, while the sum is 29.

Adding to 21140445301121 its reverse (12110354404112), we get a palindrome (33250799705233).

The spelling of 21140445301121 in words is "twenty-one trillion, one hundred forty billion, four hundred forty-five million, three hundred one thousand, one hundred twenty-one".