212501331 has 24 divisors (see below), whose sum is σ = 355031040. Its totient is φ = 119963376.

The previous prime is 212501329. The next prime is 212501351. The reversal of 212501331 is 133105212.

It is not a de Polignac number, because 212501331 - 2¹ = 212501329 is a prime.

It is a super-2 number, since 2×212501331² = 90313631353543122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212501351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15091 + ... + 25548.

It is an arithmetic number, because the mean of its divisors is an integer number (14792960).

Almost surely, 2^212501331 is an apocalyptic number.

212501331 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

212501331 is a deficient number, since it is larger than the sum of its proper divisors (142529709).

212501331 is a wasteful number, since it uses less digits than its factorization.

212501331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40735 (or 40732 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 212501331 is about 14577.4253899651. The cubic root of 212501331 is about 596.7428418639.

Adding to 212501331 its reverse (133105212), we get a palindrome (345606543).

The spelling of 212501331 in words is "two hundred twelve million, five hundred one thousand, three hundred thirty-one".