121620775 has 6 divisors (see below), whose sum is σ = 150809792. Its totient is φ = 97296600.

The previous prime is 121620773. The next prime is 121620787. The reversal of 121620775 is 577026121.

It is not a de Polignac number, because 121620775 - 2¹ = 121620773 is a prime.

It is a super-2 number, since 2×121620775² = 29583225823201250, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121620773) 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 5 ways as a sum of consecutive naturals, for example, 2432391 + ... + 2432440.

Almost surely, 2^121620775 is an apocalyptic number.

121620775 is a deficient number, since it is larger than the sum of its proper divisors (29189017).

121620775 is an equidigital number, since it uses as much as digits as its factorization.

121620775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4864841 (or 4864836 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 31.

The square root of 121620775 is about 11028.1809470103. The cubic root of 121620775 is about 495.4531442064.

Adding to 121620775 its reverse (577026121), we get a palindrome (698646896).

The spelling of 121620775 in words is "one hundred twenty-one million, six hundred twenty thousand, seven hundred seventy-five".