221222200111021 has 4 divisors (see below), whose sum is σ = 221222786270332. Its totient is φ = 221221613951712.

The previous prime is 221222200110991. The next prime is 221222200111049. The reversal of 221222200111021 is 120111002222122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 165006484885225 + 56215715225796 = 12845485^2 + 7497714^2 .

It is a cyclic number.

It is not a de Polignac number, because 221222200111021 - 2¹³ = 221222200102829 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221222200111021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221222200511021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 292513176 + ... + 293268481.

It is an arithmetic number, because the mean of its divisors is an integer number (55305696567583).

Almost surely, 2^{221222200111021} is an apocalyptic number.

It is an amenable number.

221222200111021 is a deficient number, since it is larger than the sum of its proper divisors (586159311).

221222200111021 is an equidigital number, since it uses as much as digits as its factorization.

221222200111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 586159310.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 221222200111021 its reverse (120111002222122), we get a palindrome (341333202333143).

The spelling of 221222200111021 in words is "two hundred twenty-one trillion, two hundred twenty-two billion, two hundred million, one hundred eleven thousand, twenty-one".