212041221 has 32 divisors (see below), whose sum is σ = 347950080. Its totient is φ = 112094976.

The previous prime is 212041201. The next prime is 212041231. The reversal of 212041221 is 122140212.

212041221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 212041221 - 2⁹ = 212040709 is a prime.

It is a super-2 number, since 2×212041221² = 89922958806341682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 212041221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212041201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16030 + ... + 26096.

It is an arithmetic number, because the mean of its divisors is an integer number (10873440).

Almost surely, 2^212041221 is an apocalyptic number.

212041221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

212041221 is a deficient number, since it is larger than the sum of its proper divisors (135908859).

212041221 is a wasteful number, since it uses less digits than its factorization.

212041221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10153.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 212041221 is about 14561.6352447107. The cubic root of 212041221 is about 596.3118394608.

Adding to 212041221 its reverse (122140212), we get a palindrome (334181433).

The spelling of 212041221 in words is "two hundred twelve million, forty-one thousand, two hundred twenty-one".