20411151246221 has 4 divisors (see below), whose sum is σ = 20420738449500. Its totient is φ = 20401564042944.

The previous prime is 20411151246209. The next prime is 20411151246253. The reversal of 20411151246221 is 12264215111402.

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 14662114024996 + 5749037221225 = 3829114^2 + 2397715^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20411151246221 is a prime.

It is a super-2 number, since 2×20411151246221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20411151246721) 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, 4793598446 + ... + 4793602703.

It is an arithmetic number, because the mean of its divisors is an integer number (5105184612375).

Almost surely, 2^{20411151246221} is an apocalyptic number.

It is an amenable number.

20411151246221 is a deficient number, since it is larger than the sum of its proper divisors (9587203279).

20411151246221 is an equidigital number, since it uses as much as digits as its factorization.

20411151246221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9587203278.

The product of its (nonzero) digits is 7680, while the sum is 32.

Adding to 20411151246221 its reverse (12264215111402), we get a palindrome (32675366357623).

The spelling of 20411151246221 in words is "twenty trillion, four hundred eleven billion, one hundred fifty-one million, two hundred forty-six thousand, two hundred twenty-one".