121121705 has 8 divisors (see below), whose sum is σ = 145572552. Its totient is φ = 96746368.

The previous prime is 121121699. The next prime is 121121723. The reversal of 121121705 is 507121121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 55696 + 121066009 = 236^2 + 11003^2 .

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 121121705 - 2⁶ = 121121641 is a prime.

It is a Duffinian 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, 15284 + ... + 21813.

It is an arithmetic number, because the mean of its divisors is an integer number (18196569).

Almost surely, 2^121121705 is an apocalyptic number.

It is an amenable number.

121121705 is a deficient number, since it is larger than the sum of its proper divisors (24450847).

121121705 is an equidigital number, since it uses as much as digits as its factorization.

121121705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37755.

The product of its (nonzero) digits is 140, while the sum is 20.

The square root of 121121705 is about 11005.5306550843. The cubic root of 121121705 is about 494.7745189423.

Adding to 121121705 its reverse (507121121), we get a palindrome (628242826).

The spelling of 121121705 in words is "one hundred twenty-one million, one hundred twenty-one thousand, seven hundred five".