22430821997 has 2 divisors, whose sum is σ = 22430821998. Its totient is φ = 22430821996.

The previous prime is 22430821879. The next prime is 22430821999. The reversal of 22430821997 is 79912803422.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22409790601 + 21031396 = 149699^2 + 4586^2 .

It is a cyclic number.

It is not a de Polignac number, because 22430821997 - 2¹⁴ = 22430805613 is a prime.

It is a super-2 number, since 2×22430821997² (a number of 22 digits) contains 22 as substring.

Together with 22430821999, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22430821999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11215410998 + 11215410999.

It is an arithmetic number, because the mean of its divisors is an integer number (11215410999).

Almost surely, 2^22430821997 is an apocalyptic number.

It is an amenable number.

22430821997 is a deficient number, since it is larger than the sum of its proper divisors (1).

22430821997 is an equidigital number, since it uses as much as digits as its factorization.

22430821997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 47.

The spelling of 22430821997 in words is "twenty-two billion, four hundred thirty million, eight hundred twenty-one thousand, nine hundred ninety-seven".