80212421 has 4 divisors (see below), whose sum is σ = 80238144. Its totient is φ = 80186700.

The previous prime is 80212417. The next prime is 80212423. The reversal of 80212421 is 12421208.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 80212421 - 2² = 80212417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 80212393 and 80212402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80212423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7415 + ... + 14676.

It is an arithmetic number, because the mean of its divisors is an integer number (20059536).

Almost surely, 2^80212421 is an apocalyptic number.

It is an amenable number.

80212421 is a deficient number, since it is larger than the sum of its proper divisors (25723).

80212421 is a wasteful number, since it uses less digits than its factorization.

80212421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25722.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 80212421 is about 8956.1387327352. The cubic root of 80212421 is about 431.2679735980.

Adding to 80212421 its reverse (12421208), we get a palindrome (92633629).

The spelling of 80212421 in words is "eighty million, two hundred twelve thousand, four hundred twenty-one".