120121665 has 16 divisors (see below), whose sum is σ = 192639168. Its totient is φ = 63916736.

The previous prime is 120121657. The next prime is 120121693. The reversal of 120121665 is 566121021.

It is a cyclic number.

It is not a de Polignac number, because 120121665 - 2³ = 120121657 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2394 + ... + 15683.

It is an arithmetic number, because the mean of its divisors is an integer number (12039948).

Almost surely, 2^120121665 is an apocalyptic number.

120121665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

120121665 is a deficient number, since it is larger than the sum of its proper divisors (72517503).

120121665 is a wasteful number, since it uses less digits than its factorization.

120121665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18528.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 120121665 is about 10960.0029653281. The cubic root of 120121665 is about 493.4090539462.

Adding to 120121665 its reverse (566121021), we get a palindrome (686242686).

It can be divided in two parts, 120121 and 665, that added together give a triangular number (120786 = T₄₉₁).

The spelling of 120121665 in words is "one hundred twenty million, one hundred twenty-one thousand, six hundred sixty-five".