121501765 has 16 divisors (see below), whose sum is σ = 181779840. Its totient is φ = 75741120.

The previous prime is 121501729. The next prime is 121501823. The reversal of 121501765 is 567105121.

It is not a de Polignac number, because 121501765 - 2¹¹ = 121499717 is a prime.

It is a congruent number.

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, 157410 + ... + 158179.

It is an arithmetic number, because the mean of its divisors is an integer number (11361240).

Almost surely, 2^121501765 is an apocalyptic number.

It is an amenable number.

121501765 is a deficient number, since it is larger than the sum of its proper divisors (60278075).

121501765 is a wasteful number, since it uses less digits than its factorization.

121501765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315612.

The product of its (nonzero) digits is 2100, while the sum is 28.

The square root of 121501765 is about 11022.7839042594. The cubic root of 121501765 is about 495.2914856360.

Adding to 121501765 its reverse (567105121), we get a palindrome (688606886).

The spelling of 121501765 in words is "one hundred twenty-one million, five hundred one thousand, seven hundred sixty-five".