421672221 has 6 divisors (see below), whose sum is σ = 609082110. Its totient is φ = 281114808.

The previous prime is 421672211. The next prime is 421672243. The reversal of 421672221 is 122276124.

It can be written as a sum of positive squares in only one way, i.e., 361532196 + 60140025 = 19014^2 + 7755^2 .

It is not a de Polignac number, because 421672221 - 2¹³ = 421664029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421672211) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 23426226 + ... + 23426243.

It is an arithmetic number, because the mean of its divisors is an integer number (101513685).

Almost surely, 2^421672221 is an apocalyptic number.

It is an amenable number.

421672221 is a deficient number, since it is larger than the sum of its proper divisors (187409889).

421672221 is a wasteful number, since it uses less digits than its factorization.

421672221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46852475 (or 46852472 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 421672221 is about 20534.6590183524. The cubic root of 421672221 is about 749.8798154086.

The spelling of 421672221 in words is "four hundred twenty-one million, six hundred seventy-two thousand, two hundred twenty-one".