21120222122021 has 16 divisors (see below), whose sum is σ = 23834935333440. Its totient is φ = 18537968964480.

The previous prime is 21120222121967. The next prime is 21120222122047. The reversal of 21120222122021 is 12022122202112.

It is a de Polignac number, because none of the positive numbers 2^k-21120222122021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21120222121984 and 21120222122002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120222112021) 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, 53694950 + ... + 54086856.

It is an arithmetic number, because the mean of its divisors is an integer number (1489683458340).

Almost surely, 2^{21120222122021} is an apocalyptic number.

It is an amenable number.

21120222122021 is a deficient number, since it is larger than the sum of its proper divisors (2714713211419).

21120222122021 is a wasteful number, since it uses less digits than its factorization.

21120222122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560884.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21120222122021 its reverse (12022122202112), we get a palindrome (33142344324133).

The spelling of 21120222122021 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty-two million, one hundred twenty-two thousand, twenty-one".