21222313303021 has 2 divisors, whose sum is σ = 21222313303022. Its totient is φ = 21222313303020.

The previous prime is 21222313302977. The next prime is 21222313303091. The reversal of 21222313303021 is 12030331322212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15199191120996 + 6023122182025 = 3898614^2 + 2454205^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222313303021 - 2¹⁵ = 21222313270253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222313303091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611156651510 + 10611156651511.

It is an arithmetic number, because the mean of its divisors is an integer number (10611156651511).

Almost surely, 2^{21222313303021} is an apocalyptic number.

It is an amenable number.

21222313303021 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222313303021 is an equidigital number, since it uses as much as digits as its factorization.

21222313303021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 21222313303021 its reverse (12030331322212), we get a palindrome (33252644625233).

The spelling of 21222313303021 in words is "twenty-one trillion, two hundred twenty-two billion, three hundred thirteen million, three hundred three thousand, twenty-one".