221133221993 has 4 divisors (see below), whose sum is σ = 228758505540. Its totient is φ = 213507938448.

The previous prime is 221133221917. The next prime is 221133222043. The reversal of 221133221993 is 399122331122.

It is a happy number.

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 153653808169 + 67479413824 = 391987^2 + 259768^2 .

It is a cyclic number.

It is not a de Polignac number, because 221133221993 - 2⁸ = 221133221737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221133221293) 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, 3812641730 + ... + 3812641787.

It is an arithmetic number, because the mean of its divisors is an integer number (57189626385).

Almost surely, 2^221133221993 is an apocalyptic number.

It is an amenable number.

221133221993 is a deficient number, since it is larger than the sum of its proper divisors (7625283547).

221133221993 is an equidigital number, since it uses as much as digits as its factorization.

221133221993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7625283546.

The product of its digits is 34992, while the sum is 38.

The spelling of 221133221993 in words is "two hundred twenty-one billion, one hundred thirty-three million, two hundred twenty-one thousand, nine hundred ninety-three".