221001123331 has 4 divisors (see below), whose sum is σ = 221002746664. Its totient is φ = 220999500000.

The previous prime is 221001123323. The next prime is 221001123403. The reversal of 221001123331 is 133321100122.

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

It is a cyclic number.

It is not a de Polignac number, because 221001123331 - 2³ = 221001123323 is a prime.

It is a super-2 number, since 2×221001123331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221001123299 and 221001123308.

It is not an unprimeable number, because it can be changed into a prime (221001123131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 586665 + ... + 886666.

It is an arithmetic number, because the mean of its divisors is an integer number (55250686666).

Almost surely, 2^221001123331 is an apocalyptic number.

221001123331 is a deficient number, since it is larger than the sum of its proper divisors (1623333).

221001123331 is a wasteful number, since it uses less digits than its factorization.

221001123331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1623332.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 221001123331 its reverse (133321100122), we get a palindrome (354322223453).

The spelling of 221001123331 in words is "two hundred twenty-one billion, one million, one hundred twenty-three thousand, three hundred thirty-one".