121620643 has 2 divisors, whose sum is σ = 121620644. Its totient is φ = 121620642.

The previous prime is 121620617. The next prime is 121620673. The reversal of 121620643 is 346026121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121620643 - 2⁹ = 121620131 is a prime.

It is a zygodrome in base 5.

It is not a weakly prime, because it can be changed into another prime (121620673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60810321 + 60810322.

It is an arithmetic number, because the mean of its divisors is an integer number (60810322).

Almost surely, 2^121620643 is an apocalyptic number.

121620643 is a deficient number, since it is larger than the sum of its proper divisors (1).

121620643 is an equidigital number, since it uses as much as digits as its factorization.

121620643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 121620643 is about 11028.1749623408. The cubic root of 121620643 is about 495.4529649612.

Adding to 121620643 its reverse (346026121), we get a palindrome (467646764).

The spelling of 121620643 in words is "one hundred twenty-one million, six hundred twenty thousand, six hundred forty-three".