421405222 has 16 divisors (see below), whose sum is σ = 722928672. Its totient is φ = 180472320.

The previous prime is 421405189. The next prime is 421405223. The reversal of 421405222 is 222504124.

It is a super-2 number, since 2×421405222² = 355164722257738568, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 421405193 and 421405202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421405223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10822 + ... + 30982.

It is an arithmetic number, because the mean of its divisors is an integer number (45183042).

Almost surely, 2^421405222 is an apocalyptic number.

421405222 is a deficient number, since it is larger than the sum of its proper divisors (301523450).

421405222 is a wasteful number, since it uses less digits than its factorization.

421405222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21663.

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 421405222 is about 20528.1568096115. The cubic root of 421405222 is about 749.7215096407.

Adding to 421405222 its reverse (222504124), we get a palindrome (643909346).

The spelling of 421405222 in words is "four hundred twenty-one million, four hundred five thousand, two hundred twenty-two".