121620215393 has 2 divisors, whose sum is σ = 121620215394. Its totient is φ = 121620215392.

The previous prime is 121620215359. The next prime is 121620215407. The reversal of 121620215393 is 393512026121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94146489889 + 27473725504 = 306833^2 + 165752^2 .

It is a cyclic number.

It is not a de Polignac number, because 121620215393 - 2⁶ = 121620215329 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (121620215323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60810107696 + 60810107697.

It is an arithmetic number, because the mean of its divisors is an integer number (60810107697).

Almost surely, 2^121620215393 is an apocalyptic number.

It is an amenable number.

121620215393 is a deficient number, since it is larger than the sum of its proper divisors (1).

121620215393 is an equidigital number, since it uses as much as digits as its factorization.

121620215393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 35.

The spelling of 121620215393 in words is "one hundred twenty-one billion, six hundred twenty million, two hundred fifteen thousand, three hundred ninety-three".