221000403411421 has 2 divisors, whose sum is σ = 221000403411422. Its totient is φ = 221000403411420.

The previous prime is 221000403411397. The next prime is 221000403411457. The reversal of 221000403411421 is 124114304000122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 203537616088921 + 17462787322500 = 14266661^2 + 4178850^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221000403411421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221000403412421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110500201705710 + 110500201705711.

It is an arithmetic number, because the mean of its divisors is an integer number (110500201705711).

Almost surely, 2^{221000403411421} is an apocalyptic number.

It is an amenable number.

221000403411421 is a deficient number, since it is larger than the sum of its proper divisors (1).

221000403411421 is an equidigital number, since it uses as much as digits as its factorization.

221000403411421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 221000403411421 its reverse (124114304000122), we get a palindrome (345114707411543).

The spelling of 221000403411421 in words is "two hundred twenty-one trillion, four hundred three million, four hundred eleven thousand, four hundred twenty-one".