921405304707442 has 16 divisors (see below), whose sum is σ = 1405879962901920. Its totient is φ = 452782499820768.

The previous prime is 921405304707439. The next prime is 921405304707451. The reversal of 921405304707442 is 244707403504129.

It is a self number, because there is not a number n which added to its sum of digits gives 921405304707442.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 961872708 + ... + 962830159.

It is an arithmetic number, because the mean of its divisors is an integer number (87867497681370).

Almost surely, 2^{921405304707442} is an apocalyptic number.

921405304707442 is a deficient number, since it is larger than the sum of its proper divisors (484474658194478).

921405304707442 is a wasteful number, since it uses less digits than its factorization.

921405304707442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1924706985.

The product of its (nonzero) digits is 6773760, while the sum is 52.

The spelling of 921405304707442 in words is "nine hundred twenty-one trillion, four hundred five billion, three hundred four million, seven hundred seven thousand, four hundred forty-two".