221304211031 has 4 divisors (see below), whose sum is σ = 221305802064. Its totient is φ = 221302620000.

The previous prime is 221304211013. The next prime is 221304211043. The reversal of 221304211031 is 130112403122.

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 221304211031 - 2¹⁴ = 221304194647 is a prime.

It is a super-2 number, since 2×221304211031² (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 = 221304210994 and 221304211012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221304211091) 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, 564515 + ... + 872516.

It is an arithmetic number, because the mean of its divisors is an integer number (55326450516).

Almost surely, 2^221304211031 is an apocalyptic number.

221304211031 is a deficient number, since it is larger than the sum of its proper divisors (1591033).

221304211031 is a wasteful number, since it uses less digits than its factorization.

221304211031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1591032.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 221304211031 its reverse (130112403122), we get a palindrome (351416614153).

The spelling of 221304211031 in words is "two hundred twenty-one billion, three hundred four million, two hundred eleven thousand, thirty-one".