19949221 has 12 divisors (see below), whose sum is σ = 21371052. Its totient is φ = 18615744.

The previous prime is 19949219. The next prime is 19949231. The reversal of 19949221 is 12294991.

It can be written as a sum of positive squares in 2 ways, for example, as 11826721 + 8122500 = 3439^2 + 2850^2 .

It is not a de Polignac number, because 19949221 - 2¹ = 19949219 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 (19949201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25975 + ... + 26731.

It is an arithmetic number, because the mean of its divisors is an integer number (1780921).

Almost surely, 2^19949221 is an apocalyptic number.

It is an amenable number.

19949221 is a deficient number, since it is larger than the sum of its proper divisors (1421831).

19949221 is an equidigital number, since it uses as much as digits as its factorization.

19949221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868 (or 849 counting only the distinct ones).

The product of its digits is 11664, while the sum is 37.

The square root of 19949221 is about 4466.4550820533. The cubic root of 19949221 is about 271.2118412772.

It can be divided in two parts, 199 and 49221, that multiplied together give a palindrome (9794979).

The spelling of 19949221 in words is "nineteen million, nine hundred forty-nine thousand, two hundred twenty-one".