121201645 has 16 divisors (see below), whose sum is σ = 147888000. Its totient is φ = 95344704.

The previous prime is 121201609. The next prime is 121201657. The reversal of 121201645 is 546102121.

It is a cyclic number.

It is not a de Polignac number, because 121201645 - 2¹¹ = 121199597 is a prime.

It is a super-3 number, since 3×121201645³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 80106 + ... + 81604.

It is an arithmetic number, because the mean of its divisors is an integer number (9243000).

Almost surely, 2^121201645 is an apocalyptic number.

It is an amenable number.

121201645 is a deficient number, since it is larger than the sum of its proper divisors (26686355).

121201645 is a wasteful number, since it uses less digits than its factorization.

121201645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1764.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 121201645 is about 11009.1618663729. The cubic root of 121201645 is about 494.8833449554.

Adding to 121201645 its reverse (546102121), we get a palindrome (667303766).

The spelling of 121201645 in words is "one hundred twenty-one million, two hundred one thousand, six hundred forty-five".