421567016491842 has 128 divisors (see below), whose sum is σ = 927702963855360. Its totient is φ = 126928747595520.

The previous prime is 421567016491813. The next prime is 421567016491861. The reversal of 421567016491842 is 248194610765124.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 623644803 + ... + 624320409.

It is an arithmetic number, because the mean of its divisors is an integer number (7247679405120).

Almost surely, 2^{421567016491842} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421567016491842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (463851481927680).

421567016491842 is an abundant number, since it is smaller than the sum of its proper divisors (506135947363518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421567016491842 is a wasteful number, since it uses less digits than its factorization.

421567016491842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676608.

The product of its (nonzero) digits is 23224320, while the sum is 60.

The spelling of 421567016491842 in words is "four hundred twenty-one trillion, five hundred sixty-seven billion, sixteen million, four hundred ninety-one thousand, eight hundred forty-two".