20212511325521 has 2 divisors, whose sum is σ = 20212511325522. Its totient is φ = 20212511325520.

The previous prime is 20212511325499. The next prime is 20212511325527. The reversal of 20212511325521 is 12552311521202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18548181697600 + 1664329627921 = 4306760^2 + 1290089^2 .

It is a cyclic number.

It is not a de Polignac number, because 20212511325521 - 2³⁴ = 20195331456337 is a prime.

It is a super-2 number, since 2×20212511325521² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20212511325527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106255662760 + 10106255662761.

It is an arithmetic number, because the mean of its divisors is an integer number (10106255662761).

Almost surely, 2^{20212511325521} is an apocalyptic number.

It is an amenable number.

20212511325521 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212511325521 is an equidigital number, since it uses as much as digits as its factorization.

20212511325521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12000, while the sum is 32.

Adding to 20212511325521 its reverse (12552311521202), we get a palindrome (32764822846723).

The spelling of 20212511325521 in words is "twenty trillion, two hundred twelve billion, five hundred eleven million, three hundred twenty-five thousand, five hundred twenty-one".