213570881 has 4 divisors (see below), whose sum is σ = 226133892. Its totient is φ = 201007872.

The previous prime is 213570857. The next prime is 213570883. The reversal of 213570881 is 188075312.

213570881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 173817856 + 39753025 = 13184^2 + 6305^2 .

It is a cyclic number.

It is not a de Polignac number, because 213570881 - 2²² = 209376577 is a prime.

It is a super-2 number, since 2×213570881² = 91225042422232322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213570883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6281480 + ... + 6281513.

It is an arithmetic number, because the mean of its divisors is an integer number (56533473).

Almost surely, 2^213570881 is an apocalyptic number.

It is an amenable number.

213570881 is a deficient number, since it is larger than the sum of its proper divisors (12563011).

213570881 is a wasteful number, since it uses less digits than its factorization.

213570881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12563010.

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 213570881 is about 14614.0644928097. The cubic root of 213570881 is about 597.7423312824.

The spelling of 213570881 in words is "two hundred thirteen million, five hundred seventy thousand, eight hundred eighty-one".