221201121121069 has 2 divisors, whose sum is σ = 221201121121070. Its totient is φ = 221201121121068.

The previous prime is 221201121120977. The next prime is 221201121121073. The reversal of 221201121121069 is 960121121102122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 203959442784969 + 17241678336100 = 14281437^2 + 4152310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221201121121069 is a prime.

It is a super-2 number, since 2×221201121121069² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221201121121069.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221201121125069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110600560560534 + 110600560560535.

It is an arithmetic number, because the mean of its divisors is an integer number (110600560560535).

Almost surely, 2^{221201121121069} is an apocalyptic number.

It is an amenable number.

221201121121069 is a deficient number, since it is larger than the sum of its proper divisors (1).

221201121121069 is an equidigital number, since it uses as much as digits as its factorization.

221201121121069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 31.

The spelling of 221201121121069 in words is "two hundred twenty-one trillion, two hundred one billion, one hundred twenty-one million, one hundred twenty-one thousand, sixty-nine".