212641381 has 8 divisors (see below), whose sum is σ = 215737560. Its totient is φ = 209561088.

The previous prime is 212641349. The next prime is 212641433. The reversal of 212641381 is 183146212.

212641381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1404225 + 211237156 = 1185^2 + 14534^2 .

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 212641381 - 2⁵ = 212641349 is a prime.

It is a super-2 number, since 2×212641381² = 90432713827174322, 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 (212641981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24445 + ... + 31981.

It is an arithmetic number, because the mean of its divisors is an integer number (26967195).

Almost surely, 2^212641381 is an apocalyptic number.

It is an amenable number.

212641381 is a deficient number, since it is larger than the sum of its proper divisors (3096179).

212641381 is an equidigital number, since it uses as much as digits as its factorization.

212641381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7943.

The product of its digits is 2304, while the sum is 28.

The square root of 212641381 is about 14582.2282590830. The cubic root of 212641381 is about 596.8739084654.

Adding to 212641381 its reverse (183146212), we get a palindrome (395787593).

The spelling of 212641381 in words is "two hundred twelve million, six hundred forty-one thousand, three hundred eighty-one".