213273681 has 4 divisors (see below), whose sum is σ = 284364912. Its totient is φ = 142182452.

The previous prime is 213273649. The next prime is 213273703. The reversal of 213273681 is 186372312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213273681 - 2⁵ = 213273649 is a prime.

It is a super-2 number, since 2×213273681² = 90971326014579522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (213273631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35545611 + ... + 35545616.

It is an arithmetic number, because the mean of its divisors is an integer number (71091228).

Almost surely, 2^213273681 is an apocalyptic number.

It is an amenable number.

213273681 is a deficient number, since it is larger than the sum of its proper divisors (71091231).

213273681 is an equidigital number, since it uses as much as digits as its factorization.

213273681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71091230.

The product of its digits is 12096, while the sum is 33.

The square root of 213273681 is about 14603.8926659983. The cubic root of 213273681 is about 597.4649347138.

The spelling of 213273681 in words is "two hundred thirteen million, two hundred seventy-three thousand, six hundred eighty-one".