21222110002021 has 8 divisors (see below), whose sum is σ = 21311141765760. Its totient is φ = 21133080208128.

The previous prime is 21222110001929. The next prime is 21222110002031. The reversal of 21222110002021 is 12020001122212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21222110002021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21222110001986 and 21222110002004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222110002031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23557530 + ... + 24441796.

It is an arithmetic number, because the mean of its divisors is an integer number (2663892720720).

Almost surely, 2^{21222110002021} is an apocalyptic number.

It is an amenable number.

21222110002021 is a deficient number, since it is larger than the sum of its proper divisors (89031763739).

21222110002021 is a wasteful number, since it uses less digits than its factorization.

21222110002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984923.

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

Adding to 21222110002021 its reverse (12020001122212), we get a palindrome (33242111124233).

The spelling of 21222110002021 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred ten million, two thousand, twenty-one".