213426681 has 16 divisors (see below), whose sum is σ = 306734400. Its totient is φ = 131221440.

The previous prime is 213426679. The next prime is 213426701. The reversal of 213426681 is 186624312.

It is not a de Polignac number, because 213426681 - 2¹ = 213426679 is a prime.

It is a super-2 number, since 2×213426681² = 91101896325351522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (213426611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64651 + ... + 67871.

It is an arithmetic number, because the mean of its divisors is an integer number (19170900).

Almost surely, 2^213426681 is an apocalyptic number.

It is an amenable number.

213426681 is a deficient number, since it is larger than the sum of its proper divisors (93307719).

213426681 is a wasteful number, since it uses less digits than its factorization.

213426681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4936.

The product of its digits is 13824, while the sum is 33.

The square root of 213426681 is about 14609.1300562354. The cubic root of 213426681 is about 597.6077719734.

The spelling of 213426681 in words is "two hundred thirteen million, four hundred twenty-six thousand, six hundred eighty-one".