19913213 has 8 divisors (see below), whose sum is σ = 20412000. Its totient is φ = 19419088.

The previous prime is 19913209. The next prime is 19913233. The reversal of 19913213 is 31231991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19913213 - 2² = 19913209 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 (19913203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8438 + ... + 10536.

It is an arithmetic number, because the mean of its divisors is an integer number (2551500).

Almost surely, 2^19913213 is an apocalyptic number.

It is an amenable number.

19913213 is a deficient number, since it is larger than the sum of its proper divisors (498787).

19913213 is a wasteful number, since it uses less digits than its factorization.

19913213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2331.

The product of its digits is 1458, while the sum is 29.

The square root of 19913213 is about 4462.4223242539. The cubic root of 19913213 is about 271.0485654350.

The spelling of 19913213 in words is "nineteen million, nine hundred thirteen thousand, two hundred thirteen".