221200020102121 has 2 divisors, whose sum is σ = 221200020102122. Its totient is φ = 221200020102120.

The previous prime is 221200020102107. The next prime is 221200020102169. The reversal of 221200020102121 is 121201020002122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189855026306521 + 31344993795600 = 13778789^2 + 5598660^2 .

It is a cyclic number.

It is not a de Polignac number, because 221200020102121 - 2⁹ = 221200020101609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221200020102095 and 221200020102104.

It is not a weakly prime, because it can be changed into another prime (221200020102521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110600010051060 + 110600010051061.

It is an arithmetic number, because the mean of its divisors is an integer number (110600010051061).

Almost surely, 2^{221200020102121} is an apocalyptic number.

It is an amenable number.

221200020102121 is a deficient number, since it is larger than the sum of its proper divisors (1).

221200020102121 is an equidigital number, since it uses as much as digits as its factorization.

221200020102121 is an evil number, because the sum of its binary digits is even.

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

Adding to 221200020102121 its reverse (121201020002122), we get a palindrome (342401040104243).

Subtracting from 221200020102121 its reverse (121201020002122), we obtain a palindrome (99999000099999).

The spelling of 221200020102121 in words is "two hundred twenty-one trillion, two hundred billion, twenty million, one hundred two thousand, one hundred twenty-one".