21221120022021 has 32 divisors (see below), whose sum is σ = 31545686016000. Its totient is φ = 14099285021040.

The previous prime is 21221120021999. The next prime is 21221120022059. The reversal of 21221120022021 is 12022002112212.

It is a happy number.

21221120022021 is a `hidden beast` number, since 2 + 1 + 221 + 1 + 200 + 220 + 21 = 666.

It is not a de Polignac number, because 21221120022021 - 2¹¹ = 21221120019973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21221120021985 and 21221120022003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221120023021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45168880 + ... + 45636278.

It is an arithmetic number, because the mean of its divisors is an integer number (985802688000).

Almost surely, 2^{21221120022021} is an apocalyptic number.

It is an amenable number.

21221120022021 is a deficient number, since it is larger than the sum of its proper divisors (10324565993979).

21221120022021 is a wasteful number, since it uses less digits than its factorization.

21221120022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473126 (or 473120 counting only the distinct ones).

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

Adding to 21221120022021 its reverse (12022002112212), we get a palindrome (33243122134233).

The spelling of 21221120022021 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty million, twenty-two thousand, twenty-one".