21244304131 has 16 divisors (see below), whose sum is σ = 22645702656. Its totient is φ = 19884738016.

The previous prime is 21244304129. The next prime is 21244304153. The reversal of 21244304131 is 13140344212.

It is a cyclic number.

It is not a de Polignac number, because 21244304131 - 2¹ = 21244304129 is a prime.

It is a super-2 number, since 2×21244304131² (a number of 21 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 = 21244304096 and 21244304105.

It is not an unprimeable number, because it can be changed into a prime (21244304531) 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, 444126 + ... + 489628.

It is an arithmetic number, because the mean of its divisors is an integer number (1415356416).

Almost surely, 2^21244304131 is an apocalyptic number.

21244304131 is a deficient number, since it is larger than the sum of its proper divisors (1401398525).

21244304131 is a wasteful number, since it uses less digits than its factorization.

21244304131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45962.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21244304131 its reverse (13140344212), we get a palindrome (34384648343).

The spelling of 21244304131 in words is "twenty-one billion, two hundred forty-four million, three hundred four thousand, one hundred thirty-one".