221204993433989 has 2 divisors, whose sum is σ = 221204993433990. Its totient is φ = 221204993433988.

The previous prime is 221204993433967. The next prime is 221204993433997. The reversal of 221204993433989 is 989334399402122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206527221813025 + 14677771620964 = 14371055^2 + 3831158^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221204993433989 is a prime.

It is a super-2 number, since 2×221204993433989² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (281204993433989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110602496716994 + 110602496716995.

It is an arithmetic number, because the mean of its divisors is an integer number (110602496716995).

Almost surely, 2^{221204993433989} is an apocalyptic number.

It is an amenable number.

221204993433989 is a deficient number, since it is larger than the sum of its proper divisors (1).

221204993433989 is an equidigital number, since it uses as much as digits as its factorization.

221204993433989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181398528, while the sum is 68.

The spelling of 221204993433989 in words is "two hundred twenty-one trillion, two hundred four billion, nine hundred ninety-three million, four hundred thirty-three thousand, nine hundred eighty-nine".