212215541 has 8 divisors (see below), whose sum is σ = 223872480. Its totient is φ = 200607408.

The previous prime is 212215537. The next prime is 212215589. The reversal of 212215541 is 145512212.

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 212215541 - 2² = 212215537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212215501) 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, 3086 + ... + 20831.

It is an arithmetic number, because the mean of its divisors is an integer number (27984060).

Almost surely, 2^212215541 is an apocalyptic number.

It is an amenable number.

212215541 is a deficient number, since it is larger than the sum of its proper divisors (11656939).

212215541 is a wasteful number, since it uses less digits than its factorization.

212215541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24403.

The product of its digits is 800, while the sum is 23.

The square root of 212215541 is about 14567.6196065109. The cubic root of 212215541 is about 596.4752048773.

Adding to 212215541 its reverse (145512212), we get a palindrome (357727753).

It can be divided in two parts, 21221 and 5541, that added together give a palindrome (26762).

The spelling of 212215541 in words is "two hundred twelve million, two hundred fifteen thousand, five hundred forty-one".