221021021093 has 4 divisors (see below), whose sum is σ = 221052843360. Its totient is φ = 220989198828.

The previous prime is 221021021083. The next prime is 221021021113. The reversal of 221021021093 is 390120120122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 390120120122 = 2 ⋅195060060061.

It is a cyclic number.

It is not a de Polignac number, because 221021021093 - 2⁶ = 221021021029 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021021083) 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, 15900713 + ... + 15914606.

It is an arithmetic number, because the mean of its divisors is an integer number (55263210840).

Almost surely, 2^221021021093 is an apocalyptic number.

It is an amenable number.

221021021093 is a deficient number, since it is larger than the sum of its proper divisors (31822267).

221021021093 is an equidigital number, since it uses as much as digits as its factorization.

221021021093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31822266.

The product of its (nonzero) digits is 432, while the sum is 23.

The spelling of 221021021093 in words is "two hundred twenty-one billion, twenty-one million, twenty-one thousand, ninety-three".