61130140021 has 2 divisors, whose sum is σ = 61130140022. Its totient is φ = 61130140020.

The previous prime is 61130140007. The next prime is 61130140079. The reversal of 61130140021 is 12004103116.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61055939025 + 74200996 = 247095^2 + 8614^2 .

It is a cyclic number.

It is not a de Polignac number, because 61130140021 - 2⁹ = 61130139509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61130140321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30565070010 + 30565070011.

It is an arithmetic number, because the mean of its divisors is an integer number (30565070011).

Almost surely, 2^61130140021 is an apocalyptic number.

It is an amenable number.

61130140021 is a deficient number, since it is larger than the sum of its proper divisors (1).

61130140021 is an equidigital number, since it uses as much as digits as its factorization.

61130140021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 61130140021 its reverse (12004103116), we get a palindrome (73134243137).

The spelling of 61130140021 in words is "sixty-one billion, one hundred thirty million, one hundred forty thousand, twenty-one".