212003581 has 8 divisors (see below), whose sum is σ = 221538240. Its totient is φ = 202495392.

The previous prime is 212003573. The next prime is 212003587. The reversal of 212003581 is 185300212.

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

It is a cyclic number.

It is not a de Polignac number, because 212003581 - 2³ = 212003573 is a prime.

It is a super-2 number, since 2×212003581² = 89891036713647122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212003587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10761 + ... + 23233.

It is an arithmetic number, because the mean of its divisors is an integer number (27692280).

Almost surely, 2^212003581 is an apocalyptic number.

It is an amenable number.

212003581 is a deficient number, since it is larger than the sum of its proper divisors (9534659).

212003581 is a wasteful number, since it uses less digits than its factorization.

212003581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13235.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 212003581 is about 14560.3427500866. The cubic root of 212003581 is about 596.2765530736.

Adding to 212003581 its reverse (185300212), we get a palindrome (397303793).

The spelling of 212003581 in words is "two hundred twelve million, three thousand, five hundred eighty-one".