421401366 has 56 divisors (see below), whose sum is σ = 951434640. Its totient is φ = 139917456.

The previous prime is 421401341. The next prime is 421401371. The reversal of 421401366 is 663104124.

It is a super-2 number, since 2×421401366² = 355158222533331912, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 566791 + ... + 567533.

Almost surely, 2^421401366 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421401366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (475717320).

421401366 is an abundant number, since it is smaller than the sum of its proper divisors (530033274).

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

421401366 is an equidigital number, since it uses as much as digits as its factorization.

421401366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1152 (or 1137 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 421401366 is about 20528.0628896153. The cubic root of 421401366 is about 749.7192228987.

The spelling of 421401366 in words is "four hundred twenty-one million, four hundred one thousand, three hundred sixty-six".