21220022110021 has 16 divisors (see below), whose sum is σ = 24292026278784. Its totient is φ = 18158171157504.

The previous prime is 21220022110013. The next prime is 21220022110081. The reversal of 21220022110021 is 12001122002212.

It is a happy number.

It is not a de Polignac number, because 21220022110021 - 2³ = 21220022110013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21220022109977 and 21220022110004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220022110081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24960081 + ... + 25796233.

It is an arithmetic number, because the mean of its divisors is an integer number (1518251642424).

Almost surely, 2^{21220022110021} is an apocalyptic number.

It is an amenable number.

21220022110021 is a deficient number, since it is larger than the sum of its proper divisors (3072004168763).

21220022110021 is an equidigital number, since it uses as much as digits as its factorization.

21220022110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842220.

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

Adding to 21220022110021 its reverse (12001122002212), we get a palindrome (33221144112233).

The spelling of 21220022110021 in words is "twenty-one trillion, two hundred twenty billion, twenty-two million, one hundred ten thousand, twenty-one".