81421802 has 32 divisors (see below), whose sum is σ = 160289280. Its totient is φ = 30052080.

The previous prime is 81421787. The next prime is 81421831. The reversal of 81421802 is 20812418.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10988 + ... + 16839.

It is an arithmetic number, because the mean of its divisors is an integer number (5009040).

Almost surely, 2^81421802 is an apocalyptic number.

81421802 is a deficient number, since it is larger than the sum of its proper divisors (78867478).

81421802 is a wasteful number, since it uses less digits than its factorization.

81421802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27866.

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 81421802 is about 9023.4030166008. The cubic root of 81421802 is about 433.4246128552.

The spelling of 81421802 in words is "eighty-one million, four hundred twenty-one thousand, eight hundred two".