221426675231989 has 4 divisors (see below), whose sum is σ = 221431063357900. Its totient is φ = 221422287106080.

The previous prime is 221426675231987. The next prime is 221426675232011. The reversal of 221426675231989 is 989132576624122.

221426675231989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 142137302958225 + 79289372273764 = 11922135^2 + 8904458^2 .

It is a cyclic number.

It is not a de Polignac number, because 221426675231989 - 2¹ = 221426675231987 is a prime.

It is a super-2 number, since 2×221426675231989² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221426675231987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2193987264 + ... + 2194088185.

It is an arithmetic number, because the mean of its divisors is an integer number (55357765839475).

Almost surely, 2^{221426675231989} is an apocalyptic number.

It is an amenable number.

221426675231989 is a deficient number, since it is larger than the sum of its proper divisors (4388125911).

221426675231989 is an equidigital number, since it uses as much as digits as its factorization.

221426675231989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4388125910.

The product of its digits is 156764160, while the sum is 67.

The spelling of 221426675231989 in words is "two hundred twenty-one trillion, four hundred twenty-six billion, six hundred seventy-five million, two hundred thirty-one thousand, nine hundred eighty-nine".