421991736890 has 16 divisors (see below), whose sum is σ = 770283509760. Its totient is φ = 166419276240.

The previous prime is 421991736877. The next prime is 421991736937. The reversal of 421991736890 is 98637199124.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 297176570 + ... + 297177989.

It is an arithmetic number, because the mean of its divisors is an integer number (48142719360).

Almost surely, 2^421991736890 is an apocalyptic number.

421991736890 is a deficient number, since it is larger than the sum of its proper divisors (348291772870).

421991736890 is a wasteful number, since it uses less digits than its factorization.

421991736890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594354637.

The product of its (nonzero) digits is 5878656, while the sum is 59.

The spelling of 421991736890 in words is "four hundred twenty-one billion, nine hundred ninety-one million, seven hundred thirty-six thousand, eight hundred ninety".