121621065 has 16 divisors (see below), whose sum is σ = 196017408. Its totient is φ = 64390016.

The previous prime is 121621063. The next prime is 121621067. The reversal of 121621065 is 560126121.

It is an interprime number because it is at equal distance from previous prime (121621063) and next prime (121621067).

It is a cyclic number.

It is not a de Polignac number, because 121621065 - 2¹ = 121621063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121621063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27537 + ... + 31646.

It is an arithmetic number, because the mean of its divisors is an integer number (12251088).

Almost surely, 2^121621065 is an apocalyptic number.

121621065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121621065 is a deficient number, since it is larger than the sum of its proper divisors (74396343).

121621065 is a wasteful number, since it uses less digits than its factorization.

121621065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59328.

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

The square root of 121621065 is about 11028.1940951363. The cubic root of 121621065 is about 495.4535380024.

Adding to 121621065 its reverse (560126121), we get a palindrome (681747186).

The spelling of 121621065 in words is "one hundred twenty-one million, six hundred twenty-one thousand, sixty-five".