822431431021 has 4 divisors (see below), whose sum is σ = 822438621532. Its totient is φ = 822424240512.

The previous prime is 822431430971. The next prime is 822431431027. The reversal of 822431431021 is 120134134228.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 461026062121 + 361405368900 = 678989^2 + 601170^2 .

It is a cyclic number.

It is not a de Polignac number, because 822431431021 - 2²⁵ = 822397876589 is a prime.

It is a super-2 number, since 2×822431431021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (822431431027) 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, 3420870 + ... + 3653383.

It is an arithmetic number, because the mean of its divisors is an integer number (205609655383).

Almost surely, 2^822431431021 is an apocalyptic number.

It is an amenable number.

822431431021 is a deficient number, since it is larger than the sum of its proper divisors (7190511).

822431431021 is a wasteful number, since it uses less digits than its factorization.

822431431021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7190510.

The product of its (nonzero) digits is 9216, while the sum is 31.

Adding to 822431431021 its reverse (120134134228), we get a palindrome (942565565249).

The spelling of 822431431021 in words is "eight hundred twenty-two billion, four hundred thirty-one million, four hundred thirty-one thousand, twenty-one".