80720940021 has 8 divisors (see below), whose sum is σ = 111099788544. Its totient is φ = 52078025760.

The previous prime is 80720940007. The next prime is 80720940043. The reversal of 80720940021 is 12004902708.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 80720940021 - 2⁵ = 80720939989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80720940821) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 433983456 + ... + 433983641.

It is an arithmetic number, because the mean of its divisors is an integer number (13887473568).

Almost surely, 2^80720940021 is an apocalyptic number.

It is an amenable number.

80720940021 is a deficient number, since it is larger than the sum of its proper divisors (30378848523).

80720940021 is a wasteful number, since it uses less digits than its factorization.

80720940021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867967131.

The product of its (nonzero) digits is 8064, while the sum is 33.

The spelling of 80720940021 in words is "eighty billion, seven hundred twenty million, nine hundred forty thousand, twenty-one".