21221400223 has 2 divisors, whose sum is σ = 21221400224. Its totient is φ = 21221400222.

The previous prime is 21221400217. The next prime is 21221400247. The reversal of 21221400223 is 32200412212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21221400223 - 2²¹ = 21219303071 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21221400223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221404223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610700111 + 10610700112.

It is an arithmetic number, because the mean of its divisors is an integer number (10610700112).

Almost surely, 2^21221400223 is an apocalyptic number.

21221400223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221400223 is an equidigital number, since it uses as much as digits as its factorization.

21221400223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21221400223 its reverse (32200412212), we get a palindrome (53421812435).

The spelling of 21221400223 in words is "twenty-one billion, two hundred twenty-one million, four hundred thousand, two hundred twenty-three".