822261421 has 2 divisors, whose sum is σ = 822261422. Its totient is φ = 822261420.

The previous prime is 822261403. The next prime is 822261443. The reversal of 822261421 is 124162228.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 522625321 + 299636100 = 22861^2 + 17310^2 .

It is a cyclic number.

It is not a de Polignac number, because 822261421 - 2⁹ = 822260909 is a prime.

It is a super-2 number, since 2×822261421² = 1352227688929878482, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 822261421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (822261521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411130710 + 411130711.

It is an arithmetic number, because the mean of its divisors is an integer number (411130711).

Almost surely, 2^822261421 is an apocalyptic number.

It is an amenable number.

822261421 is a deficient number, since it is larger than the sum of its proper divisors (1).

822261421 is an equidigital number, since it uses as much as digits as its factorization.

822261421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3072, while the sum is 28.

The square root of 822261421 is about 28675.1010634662. The cubic root of 822261421 is about 936.8498066153.

The spelling of 822261421 in words is "eight hundred twenty-two million, two hundred sixty-one thousand, four hundred twenty-one".