222121202010221 has 2 divisors, whose sum is σ = 222121202010222. Its totient is φ = 222121202010220.

The previous prime is 222121202010217. The next prime is 222121202010251. The reversal of 222121202010221 is 122010202121222.

222121202010221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 203224697376100 + 18896504634121 = 14255690^2 + 4347011^2 .

It is a cyclic number.

It is not a de Polignac number, because 222121202010221 - 2² = 222121202010217 is a prime.

It is a super-2 number, since 2×222121202010221² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 222121202010193 and 222121202010202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222121202010251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111060601005110 + 111060601005111.

It is an arithmetic number, because the mean of its divisors is an integer number (111060601005111).

Almost surely, 2^{222121202010221} is an apocalyptic number.

It is an amenable number.

222121202010221 is a deficient number, since it is larger than the sum of its proper divisors (1).

222121202010221 is an equidigital number, since it uses as much as digits as its factorization.

222121202010221 is an evil number, because the sum of its binary digits is even.

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

Adding to 222121202010221 its reverse (122010202121222), we get a palindrome (344131404131443).

The spelling of 222121202010221 in words is "two hundred twenty-two trillion, one hundred twenty-one billion, two hundred two million, ten thousand, two hundred twenty-one".