21022210122021 has 24 divisors (see below), whose sum is σ = 32436143078040. Its totient is φ = 13073677080576.

The previous prime is 21022210122007. The next prime is 21022210122031. The reversal of 21022210122021 is 12022101222012.

It is a happy number.

21022210122021 is a `hidden beast` number, since 210 + 2 + 2 + 210 + 1 + 220 + 21 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3652070059521 + 17370140062500 = 1911039^2 + 4167750^2 .

It is not a de Polignac number, because 21022210122021 - 2²³ = 21022201733413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21022210121985 and 21022210122003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022210122031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 607947606 + ... + 607982183.

It is an arithmetic number, because the mean of its divisors is an integer number (1351505961585).

Almost surely, 2^{21022210122021} is an apocalyptic number.

It is an amenable number.

21022210122021 is a deficient number, since it is larger than the sum of its proper divisors (11413932956019).

21022210122021 is a wasteful number, since it uses less digits than its factorization.

21022210122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1215929925 (or 1215929922 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21022210122021 its reverse (12022101222012), we get a palindrome (33044311344033).

The spelling of 21022210122021 in words is "twenty-one trillion, twenty-two billion, two hundred ten million, one hundred twenty-two thousand, twenty-one".