20121134221 has 2 divisors, whose sum is σ = 20121134222. Its totient is φ = 20121134220.

The previous prime is 20121134203. The next prime is 20121134303. The reversal of 20121134221 is 12243112102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19364114025 + 757020196 = 139155^2 + 27514^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121134221 - 2⁹ = 20121133709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20121134521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060567110 + 10060567111.

It is an arithmetic number, because the mean of its divisors is an integer number (10060567111).

Almost surely, 2^20121134221 is an apocalyptic number.

It is an amenable number.

20121134221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121134221 is an equidigital number, since it uses as much as digits as its factorization.

20121134221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 20121134221 its reverse (12243112102), we get a palindrome (32364246323).

The spelling of 20121134221 in words is "twenty billion, one hundred twenty-one million, one hundred thirty-four thousand, two hundred twenty-one".