121620131 has 2 divisors, whose sum is σ = 121620132. Its totient is φ = 121620130.

The previous prime is 121620127. The next prime is 121620133. The reversal of 121620131 is 131026121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121620131 - 2² = 121620127 is a prime.

It is a super-2 number, since 2×121620131² = 29582912528914322, which contains 22 as substring.

Together with 121620133, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121620133) 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 as a sum of consecutive naturals, namely, 60810065 + 60810066.

It is an arithmetic number, because the mean of its divisors is an integer number (60810066).

Almost surely, 2^121620131 is an apocalyptic number.

121620131 is a deficient number, since it is larger than the sum of its proper divisors (1).

121620131 is an equidigital number, since it uses as much as digits as its factorization.

121620131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 121620131 is about 11028.1517490466. The cubic root of 121620131 is about 495.4522697056.

Adding to 121620131 its reverse (131026121), we get a palindrome (252646252).

The spelling of 121620131 in words is "one hundred twenty-one million, six hundred twenty thousand, one hundred thirty-one".