221330001331 has 4 divisors (see below), whose sum is σ = 234349413192. Its totient is φ = 208310589472.

The previous prime is 221330001329. The next prime is 221330001337. The reversal of 221330001331 is 133100033122.

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 221330001331 - 2¹ = 221330001329 is a prime.

It is a super-2 number, since 2×221330001331² (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 = 221330001299 and 221330001308.

It is not an unprimeable number, because it can be changed into a prime (221330001337) 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, 6509705905 + ... + 6509705938.

It is an arithmetic number, because the mean of its divisors is an integer number (58587353298).

Almost surely, 2^221330001331 is an apocalyptic number.

221330001331 is a deficient number, since it is larger than the sum of its proper divisors (13019411861).

221330001331 is a wasteful number, since it uses less digits than its factorization.

221330001331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13019411860.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 221330001331 its reverse (133100033122), we get a palindrome (354430034453).

The spelling of 221330001331 in words is "two hundred twenty-one billion, three hundred thirty million, one thousand, three hundred thirty-one".