212321131 has 4 divisors (see below), whose sum is σ = 231623064. Its totient is φ = 193019200.

The previous prime is 212321129. The next prime is 212321167. The reversal of 212321131 is 131123212.

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

It is not a de Polignac number, because 212321131 - 2¹ = 212321129 is a prime.

It is a super-2 number, since 2×212321131² = 90160525338238322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212321101) 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, 9650950 + ... + 9650971.

It is an arithmetic number, because the mean of its divisors is an integer number (57905766).

Almost surely, 2^212321131 is an apocalyptic number.

212321131 is a deficient number, since it is larger than the sum of its proper divisors (19301933).

212321131 is a wasteful number, since it uses less digits than its factorization.

212321131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19301932.

The product of its digits is 72, while the sum is 16.

The square root of 212321131 is about 14571.2432894383. The cubic root of 212321131 is about 596.5741159086.

Adding to 212321131 its reverse (131123212), we get a palindrome (343444343).

The spelling of 212321131 in words is "two hundred twelve million, three hundred twenty-one thousand, one hundred thirty-one".