20120533376521 has 2 divisors, whose sum is σ = 20120533376522. Its totient is φ = 20120533376520.

The previous prime is 20120533376477. The next prime is 20120533376533. The reversal of 20120533376521 is 12567333502102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19220332810000 + 900200566521 = 4384100^2 + 948789^2 .

It is a cyclic number.

It is not a de Polignac number, because 20120533376521 - 2⁴³ = 11324440354313 is a prime.

It is not a weakly prime, because it can be changed into another prime (20120533376221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060266688260 + 10060266688261.

It is an arithmetic number, because the mean of its divisors is an integer number (10060266688261).

Almost surely, 2^{20120533376521} is an apocalyptic number.

It is an amenable number.

20120533376521 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120533376521 is an equidigital number, since it uses as much as digits as its factorization.

20120533376521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 226800, while the sum is 40.

Adding to 20120533376521 its reverse (12567333502102), we get a palindrome (32687866878623).

The spelling of 20120533376521 in words is "twenty trillion, one hundred twenty billion, five hundred thirty-three million, three hundred seventy-six thousand, five hundred twenty-one".