221320223031 has 16 divisors (see below), whose sum is σ = 299570508000. Its totient is φ = 145321279488.

The previous prime is 221320223009. The next prime is 221320223057. The reversal of 221320223031 is 130322023122.

It is a happy number.

It is not a de Polignac number, because 221320223031 - 2¹⁴ = 221320206647 is a prime.

It is a super-2 number, since 2×221320223031² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221320222989 and 221320223007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221320223081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1544056 + ... + 1681293.

It is an arithmetic number, because the mean of its divisors is an integer number (18723156750).

Almost surely, 2^221320223031 is an apocalyptic number.

221320223031 is a deficient number, since it is larger than the sum of its proper divisors (78250284969).

221320223031 is a wasteful number, since it uses less digits than its factorization.

221320223031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3225698.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 221320223031 its reverse (130322023122), we get a palindrome (351642246153).

The spelling of 221320223031 in words is "two hundred twenty-one billion, three hundred twenty million, two hundred twenty-three thousand, thirty-one".