81273021302 has 24 divisors (see below), whose sum is σ = 134016464736. Its totient is φ = 36937670000.

The previous prime is 81273021299. The next prime is 81273021317. The reversal of 81273021302 is 20312037218.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2593427 + ... + 2624577.

It is an arithmetic number, because the mean of its divisors is an integer number (5584019364).

Almost surely, 2^81273021302 is an apocalyptic number.

81273021302 is a deficient number, since it is larger than the sum of its proper divisors (52743443434).

81273021302 is a wasteful number, since it uses less digits than its factorization.

81273021302 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41956 (or 41945 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The spelling of 81273021302 in words is "eighty-one billion, two hundred seventy-three million, twenty-one thousand, three hundred two".