20121244061 has 2 divisors, whose sum is σ = 20121244062. Its totient is φ = 20121244060.

The previous prime is 20121244027. The next prime is 20121244079. The reversal of 20121244061 is 16044212102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13494307225 + 6626936836 = 116165^2 + 81406^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20121244061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20121241061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060622030 + 10060622031.

It is an arithmetic number, because the mean of its divisors is an integer number (10060622031).

Almost surely, 2^20121244061 is an apocalyptic number.

It is an amenable number.

20121244061 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121244061 is an equidigital number, since it uses as much as digits as its factorization.

20121244061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 20121244061 its reverse (16044212102), we get a palindrome (36165456163).

The spelling of 20121244061 in words is "twenty billion, one hundred twenty-one million, two hundred forty-four thousand, sixty-one".