100000121212261 has 2 divisors, whose sum is σ = 100000121212262. Its totient is φ = 100000121212260.

The previous prime is 100000121212183. The next prime is 100000121212273. The reversal of 100000121212261 is 162212121000001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97860191089761 + 2139930122500 = 9892431^2 + 1462850^2 .

It is a cyclic number.

It is not a de Polignac number, because 100000121212261 - 2²¹ = 100000119115109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100000121212361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50000060606130 + 50000060606131.

It is an arithmetic number, because the mean of its divisors is an integer number (50000060606131).

Almost surely, 2^{100000121212261} is an apocalyptic number.

It is an amenable number.

100000121212261 is a deficient number, since it is larger than the sum of its proper divisors (1).

100000121212261 is an equidigital number, since it uses as much as digits as its factorization.

100000121212261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 100000121212261 its reverse (162212121000001), we get a palindrome (262212242212262).

The spelling of 100000121212261 in words is "one hundred trillion, one hundred twenty-one million, two hundred twelve thousand, two hundred sixty-one".