121621135 has 4 divisors (see below), whose sum is σ = 145945368. Its totient is φ = 97296904.

The previous prime is 121621133. The next prime is 121621163. The reversal of 121621135 is 531126121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121621135 - 2¹ = 121621133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121621133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12162109 + ... + 12162118.

It is an arithmetic number, because the mean of its divisors is an integer number (36486342).

Almost surely, 2^121621135 is an apocalyptic number.

121621135 is a deficient number, since it is larger than the sum of its proper divisors (24324233).

121621135 is an equidigital number, since it uses as much as digits as its factorization.

121621135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24324232.

The product of its digits is 360, while the sum is 22.

The square root of 121621135 is about 11028.1972688196. The cubic root of 121621135 is about 495.4536330564.

Adding to 121621135 its reverse (531126121), we get a palindrome (652747256).

The spelling of 121621135 in words is "one hundred twenty-one million, six hundred twenty-one thousand, one hundred thirty-five".