421180221 has 16 divisors (see below), whose sum is σ = 700144128. Its totient is φ = 218794800.

The previous prime is 421180211. The next prime is 421180231. The reversal of 421180221 is 122081124.

It is an interprime number because it is at equal distance from previous prime (421180211) and next prime (421180231).

It is not a de Polignac number, because 421180221 - 2⁷ = 421180093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421180211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 911415 + ... + 911876.

It is an arithmetic number, because the mean of its divisors is an integer number (43759008).

Almost surely, 2^421180221 is an apocalyptic number.

It is an amenable number.

421180221 is a deficient number, since it is larger than the sum of its proper divisors (278963907).

421180221 is a wasteful number, since it uses less digits than its factorization.

421180221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1823312.

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 421180221 is about 20522.6757758339. The cubic root of 421180221 is about 749.5880528853.

The spelling of 421180221 in words is "four hundred twenty-one million, one hundred eighty thousand, two hundred twenty-one".