121604549999 has 2 divisors, whose sum is σ = 121604550000. Its totient is φ = 121604549998.

The previous prime is 121604549939. The next prime is 121604550031. The reversal of 121604549999 is 999945406121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121604549999 - 2³² = 117309582703 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121604549929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60802274999 + 60802275000.

It is an arithmetic number, because the mean of its divisors is an integer number (60802275000).

Almost surely, 2^121604549999 is an apocalyptic number.

121604549999 is a deficient number, since it is larger than the sum of its proper divisors (1).

121604549999 is an equidigital number, since it uses as much as digits as its factorization.

121604549999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6298560, while the sum is 59.

The spelling of 121604549999 in words is "one hundred twenty-one billion, six hundred four million, five hundred forty-nine thousand, nine hundred ninety-nine".