80136021 has 12 divisors (see below), whose sum is σ = 124292832. Its totient is φ = 45791928.

The previous prime is 80136013. The next prime is 80136041. The reversal of 80136021 is 12063108.

It is not a de Polignac number, because 80136021 - 2³ = 80136013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80136041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 272425 + ... + 272718.

It is an arithmetic number, because the mean of its divisors is an integer number (10357736).

Almost surely, 2^80136021 is an apocalyptic number.

It is an amenable number.

80136021 is a deficient number, since it is larger than the sum of its proper divisors (44156811).

80136021 is a wasteful number, since it uses less digits than its factorization.

80136021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545160 (or 545153 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 80136021 is about 8951.8724856870. The cubic root of 80136021 is about 431.1310066991.

Adding to 80136021 its reverse (12063108), we get a palindrome (92199129).

The spelling of 80136021 in words is "eighty million, one hundred thirty-six thousand, twenty-one".