21022122012121 has 2 divisors, whose sum is σ = 21022122012122. Its totient is φ = 21022122012120.

The previous prime is 21022122012049. The next prime is 21022122012127. The reversal of 21022122012121 is 12121022122012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13086993584025 + 7935128428096 = 3617595^2 + 2816936^2 .

It is a cyclic number.

It is not a de Polignac number, because 21022122012121 - 2⁷ = 21022122011993 is a prime.

It is a super-2 number, since 2×21022122012121² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21022122012127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511061006060 + 10511061006061.

It is an arithmetic number, because the mean of its divisors is an integer number (10511061006061).

Almost surely, 2^{21022122012121} is an apocalyptic number.

It is an amenable number.

21022122012121 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022122012121 is an equidigital number, since it uses as much as digits as its factorization.

21022122012121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21022122012121 its reverse (12121022122012), we get a palindrome (33143144134133).

It can be divided in two parts, 21022122012 and 121, that multiplied together give a palindrome (2543676763452).

The spelling of 21022122012121 in words is "twenty-one trillion, twenty-two billion, one hundred twenty-two million, twelve thousand, one hundred twenty-one".