81021714 has 8 divisors (see below), whose sum is σ = 162043440. Its totient is φ = 27007236.

The previous prime is 81021701. The next prime is 81021767. The reversal of 81021714 is 41712018.

It is a sphenic number, since it is the product of 3 distinct primes.

81021714 is an admirable number.

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 3 ways as a sum of consecutive naturals, for example, 6751804 + ... + 6751815.

It is an arithmetic number, because the mean of its divisors is an integer number (20255430).

Almost surely, 2^81021714 is an apocalyptic number.

81021714 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81021714 is a wasteful number, since it uses less digits than its factorization.

81021714 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13503624.

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 81021714 is about 9001.2062524975. The cubic root of 81021714 is about 432.7135306097.

The spelling of 81021714 in words is "eighty-one million, twenty-one thousand, seven hundred fourteen".