21220121021383 has 2 divisors, whose sum is σ = 21220121021384. Its totient is φ = 21220121021382.

The previous prime is 21220121021311. The next prime is 21220121021401. The reversal of 21220121021383 is 38312012102212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21220121021383 - 2²¹ = 21220118924231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21220121021083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610060510691 + 10610060510692.

It is an arithmetic number, because the mean of its divisors is an integer number (10610060510692).

Almost surely, 2^{21220121021383} is an apocalyptic number.

21220121021383 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220121021383 is an equidigital number, since it uses as much as digits as its factorization.

21220121021383 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 28.

Adding to 21220121021383 its reverse (38312012102212), we get a palindrome (59532133123595).

The spelling of 21220121021383 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty-one million, twenty-one thousand, three hundred eighty-three".