121856301549 has 24 divisors (see below), whose sum is σ = 180025597440. Its totient is φ = 79391446368.

The previous prime is 121856301521. The next prime is 121856301571. The reversal of 121856301549 is 945103658121.

It is a happy number.

121856301549 is a `hidden beast` number, since 1 + 2 + 1 + 8 + 5 + 630 + 1 + 5 + 4 + 9 = 666.

It is not a de Polignac number, because 121856301549 - 2⁸ = 121856301293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121856301599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 73612 + ... + 499130.

It is an arithmetic number, because the mean of its divisors is an integer number (7501066560).

Almost surely, 2^121856301549 is an apocalyptic number.

It is an amenable number.

121856301549 is a deficient number, since it is larger than the sum of its proper divisors (58169295891).

121856301549 is a wasteful number, since it uses less digits than its factorization.

121856301549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426249 (or 426246 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 45.

The spelling of 121856301549 in words is "one hundred twenty-one billion, eight hundred fifty-six million, three hundred one thousand, five hundred forty-nine".