20414436315521 has 2 divisors, whose sum is σ = 20414436315522. Its totient is φ = 20414436315520.

The previous prime is 20414436315509. The next prime is 20414436315529. The reversal of 20414436315521 is 12551363441402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18376782844225 + 2037653471296 = 4286815^2 + 1427464^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20414436315521 is a prime.

It is not a weakly prime, because it can be changed into another prime (20414436315529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10207218157760 + 10207218157761.

It is an arithmetic number, because the mean of its divisors is an integer number (10207218157761).

Almost surely, 2^{20414436315521} is an apocalyptic number.

It is an amenable number.

20414436315521 is a deficient number, since it is larger than the sum of its proper divisors (1).

20414436315521 is an equidigital number, since it uses as much as digits as its factorization.

20414436315521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 345600, while the sum is 41.

Adding to 20414436315521 its reverse (12551363441402), we get a palindrome (32965799756923).

The spelling of 20414436315521 in words is "twenty trillion, four hundred fourteen billion, four hundred thirty-six million, three hundred fifteen thousand, five hundred twenty-one".