21101002022021 has 2 divisors, whose sum is σ = 21101002022022. Its totient is φ = 21101002022020.

The previous prime is 21101002021973. The next prime is 21101002022059. The reversal of 21101002022021 is 12022020010112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16117454769025 + 4983547252996 = 4014655^2 + 2232386^2 .

It is a cyclic number.

It is not a de Polignac number, because 21101002022021 - 2¹⁰ = 21101002020997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21101002021987 and 21101002022005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21101002322021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550501011010 + 10550501011011.

It is an arithmetic number, because the mean of its divisors is an integer number (10550501011011).

Almost surely, 2^{21101002022021} is an apocalyptic number.

It is an amenable number.

21101002022021 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101002022021 is an equidigital number, since it uses as much as digits as its factorization.

21101002022021 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 14.

Adding to 21101002022021 its reverse (12022020010112), we get a palindrome (33123022032133).

The spelling of 21101002022021 in words is "twenty-one trillion, one hundred one billion, two million, twenty-two thousand, twenty-one".