121217705 has 24 divisors (see below), whose sum is σ = 173810112. Its totient is φ = 79494624.

The previous prime is 121217669. The next prime is 121217711. The reversal of 121217705 is 507712121.

It is not a de Polignac number, because 121217705 - 2⁶ = 121217641 is a prime.

It is a nialpdrome in base 15.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15242 + ... + 21788.

It is an arithmetic number, because the mean of its divisors is an integer number (7242088).

Almost surely, 2^121217705 is an apocalyptic number.

It is an amenable number.

121217705 is a deficient number, since it is larger than the sum of its proper divisors (52592407).

121217705 is an equidigital number, since it uses as much as digits as its factorization.

121217705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6605 (or 6582 counting only the distinct ones).

The product of its (nonzero) digits is 980, while the sum is 26.

The square root of 121217705 is about 11009.8912347035. The cubic root of 121217705 is about 494.9052024022.

Adding to 121217705 its reverse (507712121), we get a palindrome (628929826).

The spelling of 121217705 in words is "one hundred twenty-one million, two hundred seventeen thousand, seven hundred five".