221421022 has 16 divisors (see below), whose sum is σ = 370178640. Its totient is φ = 98713728.

The previous prime is 221421019. The next prime is 221421029. The reversal of 221421022 is 220124122.

It is a junction number, because it is equal to n+sod(n) for n = 221420987 and 221421005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221421029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170733 + ... + 172024.

It is an arithmetic number, because the mean of its divisors is an integer number (23136165).

Almost surely, 2^221421022 is an apocalyptic number.

221421022 is a deficient number, since it is larger than the sum of its proper divisors (148757618).

221421022 is a wasteful number, since it uses less digits than its factorization.

221421022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342795.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 221421022 is about 14880.2225117772. Note that the first 3 decimals coincide. The cubic root of 221421022 is about 604.9780489725.

Adding to 221421022 its reverse (220124122), we get a palindrome (441545144).

The spelling of 221421022 in words is "two hundred twenty-one million, four hundred twenty-one thousand, twenty-two".