81211302303 has 32 divisors (see below), whose sum is σ = 111048622080. Its totient is φ = 52767612000.

The previous prime is 81211302281. The next prime is 81211302323. The reversal of 81211302303 is 30320311218.

It is not a de Polignac number, because 81211302303 - 2⁶ = 81211302239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81211302323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46485276 + ... + 46487022.

It is an arithmetic number, because the mean of its divisors is an integer number (3470269440).

Almost surely, 2^81211302303 is an apocalyptic number.

81211302303 is a deficient number, since it is larger than the sum of its proper divisors (29837319777).

81211302303 is a wasteful number, since it uses less digits than its factorization.

81211302303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2987.

The product of its (nonzero) digits is 864, while the sum is 24.

The spelling of 81211302303 in words is "eighty-one billion, two hundred eleven million, three hundred two thousand, three hundred three".