221134311989 has 2 divisors, whose sum is σ = 221134311990. Its totient is φ = 221134311988.

The previous prime is 221134311971. The next prime is 221134312027. The reversal of 221134311989 is 989113431122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213598335889 + 7535976100 = 462167^2 + 86810^2 .

It is a cyclic number.

It is not a de Polignac number, because 221134311989 - 2²⁴ = 221117534773 is a prime.

It is a super-2 number, since 2×221134311989² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221134311949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110567155994 + 110567155995.

It is an arithmetic number, because the mean of its divisors is an integer number (110567155995).

Almost surely, 2^221134311989 is an apocalyptic number.

It is an amenable number.

221134311989 is a deficient number, since it is larger than the sum of its proper divisors (1).

221134311989 is an equidigital number, since it uses as much as digits as its factorization.

221134311989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 44.

The spelling of 221134311989 in words is "two hundred twenty-one billion, one hundred thirty-four million, three hundred eleven thousand, nine hundred eighty-nine".