421151220 has 72 divisors (see below), whose sum is σ = 1459995264. Its totient is φ = 96262848.

The previous prime is 421151209. The next prime is 421151233. The reversal of 421151220 is 22151124.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 421151193 and 421151202.

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 23 ways as a sum of consecutive naturals, for example, 165864 + ... + 168383.

It is an arithmetic number, because the mean of its divisors is an integer number (20277712).

Almost surely, 2^421151220 is an apocalyptic number.

It is an amenable number.

421151220 is an abundant number, since it is smaller than the sum of its proper divisors (1038844044).

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

421151220 is a wasteful number, since it uses less digits than its factorization.

421151220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334269 (or 334264 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 421151220 is about 20521.9692037582. The cubic root of 421151220 is about 749.5708478180.

The spelling of 421151220 in words is "four hundred twenty-one million, one hundred fifty-one thousand, two hundred twenty".