213216745 has 16 divisors (see below), whose sum is σ = 294053760. Its totient is φ = 145384704.

The previous prime is 213216743. The next prime is 213216821. The reversal of 213216745 is 547612312.

It is a cyclic number.

It is not a de Polignac number, because 213216745 - 2¹ = 213216743 is a prime.

It is a super-2 number, since 2×213216745² = 90922760696790050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (213216743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10752 + ... + 23281.

It is an arithmetic number, because the mean of its divisors is an integer number (18378360).

Almost surely, 2^213216745 is an apocalyptic number.

It is an amenable number.

213216745 is a deficient number, since it is larger than the sum of its proper divisors (80837015).

213216745 is a wasteful number, since it uses less digits than its factorization.

213216745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34224.

The product of its digits is 10080, while the sum is 31.

The square root of 213216745 is about 14601.9431926028. The cubic root of 213216745 is about 597.4117631412.

The spelling of 213216745 in words is "two hundred thirteen million, two hundred sixteen thousand, seven hundred forty-five".