21222000222021 has 96 divisors (see below), whose sum is σ = 33506339543040. Its totient is φ = 13396358695104.

The previous prime is 21222000222019. The next prime is 21222000222023. The reversal of 21222000222021 is 12022200022212.

It is an interprime number because it is at equal distance from previous prime (21222000222019) and next prime (21222000222023).

It is not a de Polignac number, because 21222000222021 - 2¹ = 21222000222019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21222000221985 and 21222000222003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222000222023) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1996983510 + ... + 1996994136.

It is an arithmetic number, because the mean of its divisors is an integer number (349024370240).

Almost surely, 2^{21222000222021} is an apocalyptic number.

It is an amenable number.

21222000222021 is a deficient number, since it is larger than the sum of its proper divisors (12284339321019).

21222000222021 is a wasteful number, since it uses less digits than its factorization.

21222000222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14237 (or 14225 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21222000222021 its reverse (12022200022212), we get a palindrome (33244200244233).

The spelling of 21222000222021 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty-two thousand, twenty-one".