212221131 has 4 divisors (see below), whose sum is σ = 282961512. Its totient is φ = 141480752.

The previous prime is 212221067. The next prime is 212221153. The reversal of 212221131 is 131122212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212221131 - 2⁶ = 212221067 is a prime.

It is a super-2 number, since 2×212221131² = 90075616885838322, 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 212221131.

It is not an unprimeable number, because it can be changed into a prime (212221181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35370186 + ... + 35370191.

It is an arithmetic number, because the mean of its divisors is an integer number (70740378).

Almost surely, 2^212221131 is an apocalyptic number.

212221131 is a deficient number, since it is larger than the sum of its proper divisors (70740381).

212221131 is an equidigital number, since it uses as much as digits as its factorization.

212221131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70740380.

The product of its digits is 48, while the sum is 15.

The square root of 212221131 is about 14567.8114691260. The cubic root of 212221131 is about 596.4804421110.

Adding to 212221131 its reverse (131122212), we get a palindrome (343343343).

The spelling of 212221131 in words is "two hundred twelve million, two hundred twenty-one thousand, one hundred thirty-one".