20561144001141 has 32 divisors (see below), whose sum is σ = 28211682143232. Its totient is φ = 13312078755840.

The previous prime is 20561144001127. The next prime is 20561144001241. The reversal of 20561144001141 is 14110044116502.

It is a de Polignac number, because none of the positive numbers 2^k-20561144001141 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20561144001099 and 20561144001108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20561144001241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 500092401 + ... + 500133513.

It is an arithmetic number, because the mean of its divisors is an integer number (881615066976).

Almost surely, 2^{20561144001141} is an apocalyptic number.

It is an amenable number.

20561144001141 is a deficient number, since it is larger than the sum of its proper divisors (7650538142091).

20561144001141 is a wasteful number, since it uses less digits than its factorization.

20561144001141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59613.

The product of its (nonzero) digits is 3840, while the sum is 30.

Adding to 20561144001141 its reverse (14110044116502), we get a palindrome (34671188117643).

The spelling of 20561144001141 in words is "twenty trillion, five hundred sixty-one billion, one hundred forty-four million, one thousand, one hundred forty-one".