19922213 has 4 divisors (see below), whose sum is σ = 19938828. Its totient is φ = 19905600.

The previous prime is 19922197. The next prime is 19922233. The reversal of 19922213 is 31222991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12769 + 19909444 = 113^2 + 4462^2 .

It is a cyclic number.

It is not a de Polignac number, because 19922213 - 2⁴ = 19922197 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 (19922233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6356 + ... + 8957.

It is an arithmetic number, because the mean of its divisors is an integer number (4984707).

Almost surely, 2^19922213 is an apocalyptic number.

It is an amenable number.

19922213 is a deficient number, since it is larger than the sum of its proper divisors (16615).

19922213 is a wasteful number, since it uses less digits than its factorization.

19922213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16614.

The product of its digits is 1944, while the sum is 29.

The square root of 19922213 is about 4463.4306312522. The cubic root of 19922213 is about 271.0893937646.

The spelling of 19922213 in words is "nineteen million, nine hundred twenty-two thousand, two hundred thirteen".