20131024221 has 108 divisors (see below), whose sum is σ = 38465235900. Its totient is φ = 10096289280.

The previous prime is 20131024219. The next prime is 20131024223. The reversal of 20131024221 is 12242013102.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20131024219) and next prime (20131024223).

It can be written as a sum of positive squares in 2 ways, for example, as 7109019225 + 13022004996 = 84315^2 + 114114^2 .

It is not a de Polignac number, because 20131024221 - 2¹ = 20131024219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20131024194 and 20131024203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131024223) by changing a digit.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 1540965 + ... + 1553973.

Almost surely, 2^20131024221 is an apocalyptic number.

20131024221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20131024221 is a deficient number, since it is larger than the sum of its proper divisors (18334211679).

20131024221 is a wasteful number, since it uses less digits than its factorization.

20131024221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13080 (or 13059 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 20131024221 its reverse (12242013102), we get a palindrome (32373037323).

The spelling of 20131024221 in words is "twenty billion, one hundred thirty-one million, twenty-four thousand, two hundred twenty-one".