213581970 has 96 divisors (see below), whose sum is σ = 637123968. Its totient is φ = 48628224.

The previous prime is 213581957. The next prime is 213581981. The reversal of 213581970 is 79185312.

213581970 is a `hidden beast` number, since 2 + 1 + 3 + 581 + 9 + 70 = 666.

213581970 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 218122 + ... + 219098.

It is an arithmetic number, because the mean of its divisors is an integer number (6636708).

Almost surely, 2^213581970 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 213581970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (318561984).

213581970 is an abundant number, since it is smaller than the sum of its proper divisors (423541998).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213581970 is a wasteful number, since it uses less digits than its factorization.

213581970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1344 (or 1341 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 213581970 is about 14614.4438826799. The cubic root of 213581970 is about 597.7526764037.

The spelling of 213581970 in words is "two hundred thirteen million, five hundred eighty-one thousand, nine hundred seventy".