121012505 has 8 divisors (see below), whose sum is σ = 150222600. Its totient is φ = 93471616.

The previous prime is 121012487. The next prime is 121012517. The reversal of 121012505 is 505210121.

It can be written as a sum of positive squares in 4 ways, for example, as 100489 + 120912016 = 317^2 + 10996^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121012505 - 2⁸ = 121012249 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 417140 + ... + 417429.

It is an arithmetic number, because the mean of its divisors is an integer number (18777825).

Almost surely, 2^121012505 is an apocalyptic number.

It is an amenable number.

121012505 is a deficient number, since it is larger than the sum of its proper divisors (29210095).

121012505 is an equidigital number, since it uses as much as digits as its factorization.

121012505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834603.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 121012505 is about 11000.5683944058. The cubic root of 121012505 is about 494.6257825323.

Adding to 121012505 its reverse (505210121), we get a palindrome (626222626).

The spelling of 121012505 in words is "one hundred twenty-one million, twelve thousand, five hundred five".