121005501 has 4 divisors (see below), whose sum is σ = 161340672. Its totient is φ = 80670332.

The previous prime is 121005491. The next prime is 121005529. The reversal of 121005501 is 105500121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121005501 - 2¹¹ = 121003453 is a prime.

It is a super-2 number, since 2×121005501² = 29284662544522002, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121005581) 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 3 ways as a sum of consecutive naturals, for example, 20167581 + ... + 20167586.

It is an arithmetic number, because the mean of its divisors is an integer number (40335168).

Almost surely, 2^121005501 is an apocalyptic number.

It is an amenable number.

121005501 is a deficient number, since it is larger than the sum of its proper divisors (40335171).

121005501 is an equidigital number, since it uses as much as digits as its factorization.

121005501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40335170.

The product of its (nonzero) digits is 50, while the sum is 15.

The square root of 121005501 is about 11000.2500426127. The cubic root of 121005501 is about 494.6162396457.

Adding to 121005501 its reverse (105500121), we get a palindrome (226505622).

The spelling of 121005501 in words is "one hundred twenty-one million, five thousand, five hundred one".