21022010101021 has 2 divisors, whose sum is σ = 21022010101022. Its totient is φ = 21022010101020.

The previous prime is 21022010101009. The next prime is 21022010101093. The reversal of 21022010101021 is 12010101022012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19148632087225 + 1873378013796 = 4375915^2 + 1368714^2 .

It is a cyclic number.

It is not a de Polignac number, because 21022010101021 - 2¹⁷ = 21022009969949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21022010100992 and 21022010101010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21022010101621) 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, 10511005050510 + 10511005050511.

It is an arithmetic number, because the mean of its divisors is an integer number (10511005050511).

Almost surely, 2^{21022010101021} is an apocalyptic number.

It is an amenable number.

21022010101021 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022010101021 is an equidigital number, since it uses as much as digits as its factorization.

21022010101021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21022010101021 its reverse (12010101022012), we get a palindrome (33032111123033).

The spelling of 21022010101021 in words is "twenty-one trillion, twenty-two billion, ten million, one hundred one thousand, twenty-one".