921384109642 has 16 divisors (see below), whose sum is σ = 1415922048072. Its totient is φ = 449412263680.

The previous prime is 921384109579. The next prime is 921384109649. The reversal of 921384109642 is 246901483129.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 530407780681 + 390976328961 = 728291^2 + 625281^2 .

It is not an unprimeable number, because it can be changed into a prime (921384109649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 320208 + ... + 1394740.

Almost surely, 2^921384109642 is an apocalyptic number.

921384109642 is a deficient number, since it is larger than the sum of its proper divisors (494537938430).

921384109642 is a wasteful number, since it uses less digits than its factorization.

921384109642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1085033.

The product of its (nonzero) digits is 746496, while the sum is 49.

The spelling of 921384109642 in words is "nine hundred twenty-one billion, three hundred eighty-four million, one hundred nine thousand, six hundred forty-two".