21220222000021 has 32 divisors (see below), whose sum is σ = 24401016357120. Its totient is φ = 18265158912000.

The previous prime is 21220222000001. The next prime is 21220222000037. The reversal of 21220222000021 is 12000022202212.

It is not a de Polignac number, because 21220222000021 - 2¹⁵ = 21220221967253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21220221999959 and 21220222000004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220222000001) 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, 105510085 + ... + 105711013.

It is an arithmetic number, because the mean of its divisors is an integer number (762531761160).

Almost surely, 2^{21220222000021} is an apocalyptic number.

It is an amenable number.

21220222000021 is a deficient number, since it is larger than the sum of its proper divisors (3180794357099).

21220222000021 is a wasteful number, since it uses less digits than its factorization.

21220222000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205197.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21220222000021 its reverse (12000022202212), we get a palindrome (33220244202233).

The spelling of 21220222000021 in words is "twenty-one trillion, two hundred twenty billion, two hundred twenty-two million, twenty-one", and thus it is an aban number.