421721166 has 8 divisors (see below), whose sum is σ = 843442344. Its totient is φ = 140573720.

The previous prime is 421721089. The next prime is 421721171. The reversal of 421721166 is 661127124.

It is a sphenic number, since it is the product of 3 distinct primes.

421721166 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35143425 + ... + 35143436.

It is an arithmetic number, because the mean of its divisors is an integer number (105430293).

Almost surely, 2^421721166 is an apocalyptic number.

421721166 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

421721166 is a wasteful number, since it uses less digits than its factorization.

421721166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70286866.

The product of its digits is 4032, while the sum is 30.

The square root of 421721166 is about 20535.8507493603. The cubic root of 421721166 is about 749.9088280285.

The spelling of 421721166 in words is "four hundred twenty-one million, seven hundred twenty-one thousand, one hundred sixty-six".