21434212224221 has 2 divisors, whose sum is σ = 21434212224222. Its totient is φ = 21434212224220.

The previous prime is 21434212224209. The next prime is 21434212224239. The reversal of 21434212224221 is 12242221243412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21348881635225 + 85330588996 = 4620485^2 + 292114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21434212224221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21434212227221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10717106112110 + 10717106112111.

It is an arithmetic number, because the mean of its divisors is an integer number (10717106112111).

Almost surely, 2^{21434212224221} is an apocalyptic number.

It is an amenable number.

21434212224221 is a deficient number, since it is larger than the sum of its proper divisors (1).

21434212224221 is an equidigital number, since it uses as much as digits as its factorization.

21434212224221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24576, while the sum is 32.

Adding to 21434212224221 its reverse (12242221243412), we get a palindrome (33676433467633).

The spelling of 21434212224221 in words is "twenty-one trillion, four hundred thirty-four billion, two hundred twelve million, two hundred twenty-four thousand, two hundred twenty-one".