1922221 has 6 divisors (see below), whose sum is σ = 2236110. Its totient is φ = 1647576.

The previous prime is 1922213. The next prime is 1922233. The reversal of 1922221 is 1222291.

It can be written as a sum of positive squares in only one way, i.e., 1920996 + 1225 = 1386^2 + 35^2 .

It is not a de Polignac number, because 1922221 - 2³ = 1922213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1922621) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19566 + ... + 19663.

It is an arithmetic number, because the mean of its divisors is an integer number (372685).

2^1922221 is an apocalyptic number.

It is an amenable number.

1922221 is a deficient number, since it is larger than the sum of its proper divisors (313889).

1922221 is an equidigital number, since it uses as much as digits as its factorization.

1922221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39243 (or 39236 counting only the distinct ones).

The product of its digits is 144, while the sum is 19.

The square root of 1922221 is about 1386.4418487625. The cubic root of 1922221 is about 124.3372065165.

The spelling of 1922221 in words is "one million, nine hundred twenty-two thousand, two hundred twenty-one".