21224404102361 has 2 divisors, whose sum is σ = 21224404102362. Its totient is φ = 21224404102360.

The previous prime is 21224404102339. The next prime is 21224404102459. The reversal of 21224404102361 is 16320140442212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17798273440000 + 3426130662361 = 4218800^2 + 1850981^2 .

It is a cyclic number.

It is not a de Polignac number, because 21224404102361 - 2³⁰ = 21223330360537 is a prime.

It is not a weakly prime, because it can be changed into another prime (21224404102861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10612202051180 + 10612202051181.

It is an arithmetic number, because the mean of its divisors is an integer number (10612202051181).

Almost surely, 2^{21224404102361} is an apocalyptic number.

It is an amenable number.

21224404102361 is a deficient number, since it is larger than the sum of its proper divisors (1).

21224404102361 is an equidigital number, since it uses as much as digits as its factorization.

21224404102361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18432, while the sum is 32.

Adding to 21224404102361 its reverse (16320140442212), we get a palindrome (37544544544573).

The spelling of 21224404102361 in words is "twenty-one trillion, two hundred twenty-four billion, four hundred four million, one hundred two thousand, three hundred sixty-one".