81080421 has 8 divisors (see below), whose sum is σ = 108155520. Its totient is φ = 54029472.

The previous prime is 81080401. The next prime is 81080423. The reversal of 81080421 is 12408018.

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

It is a de Polignac number, because none of the positive numbers 2^k-81080421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81080391 and 81080400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81080423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4356 + ... + 13458.

It is an arithmetic number, because the mean of its divisors is an integer number (13519440).

Almost surely, 2^81080421 is an apocalyptic number.

It is an amenable number.

81080421 is a deficient number, since it is larger than the sum of its proper divisors (27075099).

81080421 is a wasteful number, since it uses less digits than its factorization.

81080421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12075.

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 81080421 is about 9004.4667249094. The cubic root of 81080421 is about 432.8180177439.

Adding to 81080421 its reverse (12408018), we get a palindrome (93488439).

The spelling of 81080421 in words is "eighty-one million, eighty thousand, four hundred twenty-one".