81212350 has 24 divisors (see below), whose sum is σ = 153537048. Its totient is φ = 31951200.

The previous prime is 81212297. The next prime is 81212353. The reversal of 81212350 is 5321218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81212353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10264 + ... + 16363.

It is an arithmetic number, because the mean of its divisors is an integer number (6397377).

Almost surely, 2^81212350 is an apocalyptic number.

81212350 is a deficient number, since it is larger than the sum of its proper divisors (72324698).

81212350 is a wasteful number, since it uses less digits than its factorization.

81212350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26700 (or 26695 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 81212350 is about 9011.7895004266. The cubic root of 81212350 is about 433.0526420218.

Adding to 81212350 its reverse (5321218), we get a palindrome (86533568).

The spelling of 81212350 in words is "eighty-one million, two hundred twelve thousand, three hundred fifty".