81273021303 has 72 divisors (see below), whose sum is σ = 122789149392. Its totient is φ = 47794987008.

The previous prime is 81273021299. The next prime is 81273021317. The reversal of 81273021303 is 30312037218.

It is not a de Polignac number, because 81273021303 - 2² = 81273021299 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81273025303) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 30358401 + ... + 30361077.

Almost surely, 2^81273021303 is an apocalyptic number.

81273021303 is a deficient number, since it is larger than the sum of its proper divisors (41516128089).

81273021303 is a wasteful number, since it uses less digits than its factorization.

81273021303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2849 (or 2813 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The spelling of 81273021303 in words is "eighty-one billion, two hundred seventy-three million, twenty-one thousand, three hundred three".