81421702 has 16 divisors (see below), whose sum is σ = 129536352. Its totient is φ = 38301120.

The previous prime is 81421699. The next prime is 81421723. The reversal of 81421702 is 20712418.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 11703 + ... + 17314.

It is an arithmetic number, because the mean of its divisors is an integer number (8096022).

Almost surely, 2^81421702 is an apocalyptic number.

81421702 is a deficient number, since it is larger than the sum of its proper divisors (48114650).

81421702 is a wasteful number, since it uses less digits than its factorization.

81421702 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29103.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 81421702 is about 9023.3974754524. The cubic root of 81421702 is about 433.4244354151.

The spelling of 81421702 in words is "eighty-one million, four hundred twenty-one thousand, seven hundred two".