121002145505 has 24 divisors (see below), whose sum is σ = 154403808000. Its totient is φ = 91014485760.

The previous prime is 121002145493. The next prime is 121002145519. The reversal of 121002145505 is 505541200121.

It is not a de Polignac number, because 121002145505 - 2⁴ = 121002145489 is a prime.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1389746 + ... + 1474244.

It is an arithmetic number, because the mean of its divisors is an integer number (6433492000).

Almost surely, 2^121002145505 is an apocalyptic number.

It is an amenable number.

121002145505 is a deficient number, since it is larger than the sum of its proper divisors (33401662495).

121002145505 is an equidigital number, since it uses as much as digits as its factorization.

121002145505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85529 (or 85512 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 26.

Adding to 121002145505 its reverse (505541200121), we get a palindrome (626543345626).

The spelling of 121002145505 in words is "one hundred twenty-one billion, two million, one hundred forty-five thousand, five hundred five".