121620541 has 4 divisors (see below), whose sum is σ = 138994912. Its totient is φ = 104246172.

The previous prime is 121620529. The next prime is 121620571. The reversal of 121620541 is 145026121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 145026121 = 113 ⋅1283417.

It is a cyclic number.

It is not a de Polignac number, because 121620541 - 2⁵ = 121620509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121620571) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 8687175 + ... + 8687188.

It is an arithmetic number, because the mean of its divisors is an integer number (34748728).

Almost surely, 2^121620541 is an apocalyptic number.

It is an amenable number.

121620541 is a deficient number, since it is larger than the sum of its proper divisors (17374371).

121620541 is an equidigital number, since it uses as much as digits as its factorization.

121620541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17374370.

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

The square root of 121620541 is about 11028.1703378212. The cubic root of 121620541 is about 495.4528264534.

Adding to 121620541 its reverse (145026121), we get a palindrome (266646662).

The spelling of 121620541 in words is "one hundred twenty-one million, six hundred twenty thousand, five hundred forty-one".