21131143131 has 24 divisors (see below), whose sum is σ = 32786181120. Its totient is φ = 12070758672.

The previous prime is 21131143081. The next prime is 21131143169. The reversal of 21131143131 is 13134113112.

It is not a de Polignac number, because 21131143131 - 2¹⁷ = 21131012059 is a prime.

It is a super-2 number, since 2×21131143131² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 21131143098 and 21131143107.

It is not an unprimeable number, because it can be changed into a prime (21131143181) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 429270 + ... + 475956.

It is an arithmetic number, because the mean of its divisors is an integer number (1366090880).

Almost surely, 2^21131143131 is an apocalyptic number.

21131143131 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21131143131 is a deficient number, since it is larger than the sum of its proper divisors (11655037989).

21131143131 is a wasteful number, since it uses less digits than its factorization.

21131143131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49783 (or 49776 counting only the distinct ones).

The product of its digits is 216, while the sum is 21.

Adding to 21131143131 its reverse (13134113112), we get a palindrome (34265256243).

The spelling of 21131143131 in words is "twenty-one billion, one hundred thirty-one million, one hundred forty-three thousand, one hundred thirty-one".