81021346 has 16 divisors (see below), whose sum is σ = 139018176. Its totient is φ = 34692336.

The previous prime is 81021271. The next prime is 81021407. The reversal of 81021346 is 64312018.

It is a self number, because there is not a number n which added to its sum of digits gives 81021346.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21000 + ... + 24556.

It is an arithmetic number, because the mean of its divisors is an integer number (8688636).

Almost surely, 2^81021346 is an apocalyptic number.

81021346 is a deficient number, since it is larger than the sum of its proper divisors (57996830).

81021346 is a wasteful number, since it uses less digits than its factorization.

81021346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5193.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 81021346 is about 9001.1858107696. The cubic root of 81021346 is about 432.7128754815.

The spelling of 81021346 in words is "eighty-one million, twenty-one thousand, three hundred forty-six".