19812213 has 6 divisors (see below), whose sum is σ = 28617654. Its totient is φ = 13208136.

The previous prime is 19812211. The next prime is 19812253. The reversal of 19812213 is 31221891.

It can be written as a sum of positive squares in only one way, i.e., 11009124 + 8803089 = 3318^2 + 2967^2 .

It is not a de Polignac number, because 19812213 - 2¹ = 19812211 is a prime.

It is a super-3 number, since 3×19812213³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19812211) 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, 1100670 + ... + 1100687.

It is an arithmetic number, because the mean of its divisors is an integer number (4769609).

Almost surely, 2^19812213 is an apocalyptic number.

It is an amenable number.

19812213 is a deficient number, since it is larger than the sum of its proper divisors (8805441).

19812213 is a wasteful number, since it uses less digits than its factorization.

19812213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2201363 (or 2201360 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 19812213 is about 4451.0912145226. The cubic root of 19812213 is about 270.5895348811.

It can be divided in two parts, 198122 and 13, that added together give a triangular number (198135 = T₆₂₉).

The spelling of 19812213 in words is "nineteen million, eight hundred twelve thousand, two hundred thirteen".