121505101 has 2 divisors, whose sum is σ = 121505102. Its totient is φ = 121505100.

The previous prime is 121505093. The next prime is 121505141. The reversal of 121505101 is 101505121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78340201 + 43164900 = 8851^2 + 6570^2 .

It is an emirp because it is prime and its reverse (101505121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121505101 - 2³ = 121505093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121505141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60752550 + 60752551.

It is an arithmetic number, because the mean of its divisors is an integer number (60752551).

Almost surely, 2^121505101 is an apocalyptic number.

It is an amenable number.

121505101 is a deficient number, since it is larger than the sum of its proper divisors (1).

121505101 is an equidigital number, since it uses as much as digits as its factorization.

121505101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50, while the sum is 16.

The square root of 121505101 is about 11022.9352261546. The cubic root of 121505101 is about 495.2960185668.

The spelling of 121505101 in words is "one hundred twenty-one million, five hundred five thousand, one hundred one".