213721017 has 8 divisors (see below), whose sum is σ = 285349920. Its totient is φ = 142286400.

The previous prime is 213720989. The next prime is 213721103. The reversal of 213721017 is 710127312.

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

It is not a de Polignac number, because 213721017 - 2¹⁴ = 213704633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213721217) 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, 45984 + ... + 50417.

It is an arithmetic number, because the mean of its divisors is an integer number (35668740).

Almost surely, 2^213721017 is an apocalyptic number.

It is an amenable number.

213721017 is a deficient number, since it is larger than the sum of its proper divisors (71628903).

213721017 is an equidigital number, since it uses as much as digits as its factorization.

213721017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97143.

The product of its (nonzero) digits is 588, while the sum is 24.

The square root of 213721017 is about 14619.2002859254. The cubic root of 213721017 is about 597.8823653878.

Adding to 213721017 its reverse (710127312), we get a palindrome (923848329).

The spelling of 213721017 in words is "two hundred thirteen million, seven hundred twenty-one thousand, seventeen".