201022101220021 has 2 divisors, whose sum is σ = 201022101220022. Its totient is φ = 201022101220020.

The previous prime is 201022101219991. The next prime is 201022101220097. The reversal of 201022101220021 is 120022101220102.

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., 190203100119396 + 10819001100625 = 13791414^2 + 3289225^2 .

It is a cyclic number.

It is not a de Polignac number, because 201022101220021 - 2⁹ = 201022101219509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201022101219977 and 201022101220004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201022101220121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100511050610010 + 100511050610011.

It is an arithmetic number, because the mean of its divisors is an integer number (100511050610011).

Almost surely, 2^{201022101220021} is an apocalyptic number.

It is an amenable number.

201022101220021 is a deficient number, since it is larger than the sum of its proper divisors (1).

201022101220021 is an equidigital number, since it uses as much as digits as its factorization.

201022101220021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 201022101220021 its reverse (120022101220102), we get a palindrome (321044202440123).

The spelling of 201022101220021 in words is "two hundred one trillion, twenty-two billion, one hundred one million, two hundred twenty thousand, twenty-one".