21121140042241 has 4 divisors (see below), whose sum is σ = 21181659068500. Its totient is φ = 21060621015984.

The previous prime is 21121140042239. The next prime is 21121140042263. The reversal of 21121140042241 is 14224004112112.

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 16584474339216 + 4536665703025 = 4072404^2 + 2129945^2 .

It is a cyclic number.

It is not a de Polignac number, because 21121140042241 - 2¹ = 21121140042239 is a prime.

It is a super-2 number, since 2×21121140042241² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121140042221) 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, 30259512606 + ... + 30259513303.

It is an arithmetic number, because the mean of its divisors is an integer number (5295414767125).

Almost surely, 2^{21121140042241} is an apocalyptic number.

It is an amenable number.

21121140042241 is a deficient number, since it is larger than the sum of its proper divisors (60519026259).

21121140042241 is an equidigital number, since it uses as much as digits as its factorization.

21121140042241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60519026258.

The product of its (nonzero) digits is 1024, while the sum is 25.

Adding to 21121140042241 its reverse (14224004112112), we get a palindrome (35345144154353).

The spelling of 21121140042241 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred forty million, forty-two thousand, two hundred forty-one".