121505100501 has 16 divisors (see below), whose sum is σ = 177070053888. Its totient is φ = 73779187200.

The previous prime is 121505100469. The next prime is 121505100503. The reversal of 121505100501 is 105001505121.

It is not a de Polignac number, because 121505100501 - 2⁵ = 121505100469 is a prime.

It is a super-2 number, since 2×121505100501² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121505100503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38425080 + ... + 38428241.

It is an arithmetic number, because the mean of its divisors is an integer number (11066878368).

Almost surely, 2^121505100501 is an apocalyptic number.

It is an amenable number.

121505100501 is a deficient number, since it is larger than the sum of its proper divisors (55564953387).

121505100501 is a wasteful number, since it uses less digits than its factorization.

121505100501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76853372.

The product of its (nonzero) digits is 250, while the sum is 21.

Adding to 121505100501 its reverse (105001505121), we get a palindrome (226506605622).

The spelling of 121505100501 in words is "one hundred twenty-one billion, five hundred five million, one hundred thousand, five hundred one".