221171022 has 24 divisors (see below), whose sum is σ = 479886264. Its totient is φ = 73618704.

The previous prime is 221171021. The next prime is 221171029. The reversal of 221171022 is 220171122.

It is a happy number.

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 = 221170986 and 221171004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221171021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4813 + ... + 21575.

It is an arithmetic number, because the mean of its divisors is an integer number (19995261).

Almost surely, 2^221171022 is an apocalyptic number.

221171022 is an abundant number, since it is smaller than the sum of its proper divisors (258715242).

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

221171022 is a wasteful number, since it uses less digits than its factorization.

221171022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17504 (or 17501 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 221171022 is about 14871.8197272560. The cubic root of 221171022 is about 604.7502755531.

The spelling of 221171022 in words is "two hundred twenty-one million, one hundred seventy-one thousand, twenty-two".