120405421866457 has 64 divisors (see below), whose sum is σ = 149462944727040. Its totient is φ = 95013742824000.

The previous prime is 120405421866409. The next prime is 120405421866469. The reversal of 120405421866457 is 754668124504021.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-120405421866457 is a prime.

It is a super-2 number, since 2×120405421866457² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 120405421866398 and 120405421866407.

It is not an unprimeable number, because it can be changed into a prime (120405421869457) 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 63 ways as a sum of consecutive naturals, for example, 27420954732 + ... + 27420959122.

It is an arithmetic number, because the mean of its divisors is an integer number (2335358511360).

Almost surely, 2^{120405421866457} is an apocalyptic number.

It is an amenable number.

120405421866457 is a deficient number, since it is larger than the sum of its proper divisors (29057522860583).

120405421866457 is an equidigital number, since it uses as much as digits as its factorization.

120405421866457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8751 (or 8725 counting only the distinct ones).

The product of its (nonzero) digits is 12902400, while the sum is 55.

The spelling of 120405421866457 in words is "one hundred twenty trillion, four hundred five billion, four hundred twenty-one million, eight hundred sixty-six thousand, four hundred fifty-seven".