100121244521 has 2 divisors, whose sum is σ = 100121244522. Its totient is φ = 100121244520.

The previous prime is 100121244389. The next prime is 100121244599. The reversal of 100121244521 is 125442121001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99729640000 + 391604521 = 315800^2 + 19789^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100121244521 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (100121244121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50060622260 + 50060622261.

It is an arithmetic number, because the mean of its divisors is an integer number (50060622261).

Almost surely, 2^100121244521 is an apocalyptic number.

It is an amenable number.

100121244521 is a deficient number, since it is larger than the sum of its proper divisors (1).

100121244521 is an equidigital number, since it uses as much as digits as its factorization.

100121244521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 23.

Adding to 100121244521 its reverse (125442121001), we get a palindrome (225563365522).

The spelling of 100121244521 in words is "one hundred billion, one hundred twenty-one million, two hundred forty-four thousand, five hundred twenty-one".