921351803642 has 4 divisors (see below), whose sum is σ = 1382027705466. Its totient is φ = 460675901820.

The previous prime is 921351803627. The next prime is 921351803653. The reversal of 921351803642 is 246308153129.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 856326293641 + 65025510001 = 925379^2 + 255001^2 .

It is a junction number, because it is equal to n+sod(n) for n = 921351803593 and 921351803602.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 230337950909 + ... + 230337950912.

Almost surely, 2^921351803642 is an apocalyptic number.

921351803642 is a deficient number, since it is larger than the sum of its proper divisors (460675901824).

921351803642 is a wasteful number, since it uses less digits than its factorization.

921351803642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460675901823.

The product of its (nonzero) digits is 311040, while the sum is 44.

The spelling of 921351803642 in words is "nine hundred twenty-one billion, three hundred fifty-one million, eight hundred three thousand, six hundred forty-two".