21022010020021 has 2 divisors, whose sum is σ = 21022010020022. Its totient is φ = 21022010020020.

The previous prime is 21022010020013. The next prime is 21022010020103. The reversal of 21022010020021 is 12002001022012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20821562194225 + 200447825796 = 4563065^2 + 447714^2 .

It is a cyclic number.

It is not a de Polignac number, because 21022010020021 - 2³ = 21022010020013 is a prime.

It is a super-3 number, since 3×21022010020021³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21022010019983 and 21022010020010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21022010920021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511005010010 + 10511005010011.

It is an arithmetic number, because the mean of its divisors is an integer number (10511005010011).

Almost surely, 2^{21022010020021} is an apocalyptic number.

It is an amenable number.

21022010020021 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022010020021 is an equidigital number, since it uses as much as digits as its factorization.

21022010020021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21022010020021 its reverse (12002001022012), we get a palindrome (33024011042033).

The spelling of 21022010020021 in words is "twenty-one trillion, twenty-two billion, ten million, twenty thousand, twenty-one".