121220520349 has 2 divisors, whose sum is σ = 121220520350. Its totient is φ = 121220520348.

The previous prime is 121220520307. The next prime is 121220520373. The reversal of 121220520349 is 943025022121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83445876900 + 37774643449 = 288870^2 + 194357^2 .

It is a cyclic number.

It is not a de Polignac number, because 121220520349 - 2²³ = 121212131741 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121220520349.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121220520149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610260174 + 60610260175.

It is an arithmetic number, because the mean of its divisors is an integer number (60610260175).

Almost surely, 2^121220520349 is an apocalyptic number.

It is an amenable number.

121220520349 is a deficient number, since it is larger than the sum of its proper divisors (1).

121220520349 is an equidigital number, since it uses as much as digits as its factorization.

121220520349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 121220520349 in words is "one hundred twenty-one billion, two hundred twenty million, five hundred twenty thousand, three hundred forty-nine".