812273021 has 8 divisors (see below), whose sum is σ = 928484544. Its totient is φ = 696104640.

The previous prime is 812273003. The next prime is 812273027. The reversal of 812273021 is 120372218.

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

It is not a de Polignac number, because 812273021 - 2⁶ = 812272957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812273027) 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, 66626 + ... + 77868.

It is an arithmetic number, because the mean of its divisors is an integer number (116060568).

Almost surely, 2^812273021 is an apocalyptic number.

It is an amenable number.

812273021 is a deficient number, since it is larger than the sum of its proper divisors (116211523).

812273021 is a wasteful number, since it uses less digits than its factorization.

812273021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21571.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 812273021 is about 28500.4038743313. The cubic root of 812273021 is about 933.0408886348.

It can be divided in two parts, 81227 and 3021, that added together give a palindrome (84248).

The spelling of 812273021 in words is "eight hundred twelve million, two hundred seventy-three thousand, twenty-one".