21214222332421 has 2 divisors, whose sum is σ = 21214222332422. Its totient is φ = 21214222332420.

The previous prime is 21214222332283. The next prime is 21214222332451. The reversal of 21214222332421 is 12423322241212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12294209816100 + 8920012516321 = 3506310^2 + 2986639^2 .

It is a cyclic number.

It is not a de Polignac number, because 21214222332421 - 2¹⁷ = 21214222201349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21214222332451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10607111166210 + 10607111166211.

It is an arithmetic number, because the mean of its divisors is an integer number (10607111166211).

Almost surely, 2^{21214222332421} is an apocalyptic number.

It is an amenable number.

21214222332421 is a deficient number, since it is larger than the sum of its proper divisors (1).

21214222332421 is an equidigital number, since it uses as much as digits as its factorization.

21214222332421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18432, while the sum is 31.

Adding to 21214222332421 its reverse (12423322241212), we get a palindrome (33637544573633).

The spelling of 21214222332421 in words is "twenty-one trillion, two hundred fourteen billion, two hundred twenty-two million, three hundred thirty-two thousand, four hundred twenty-one".