21131431041 has 16 divisors (see below), whose sum is σ = 32204455808. Its totient is φ = 12073536000.

The previous prime is 21131430949. The next prime is 21131431081. The reversal of 21131431041 is 14013413112.

It is not a de Polignac number, because 21131431041 - 2¹³ = 21131422849 is a prime.

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 = 21131430999 and 21131431017.

It is not an unprimeable number, because it can be changed into a prime (21131431081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111441 + ... + 233841.

It is an arithmetic number, because the mean of its divisors is an integer number (2012778488).

Almost surely, 2^21131431041 is an apocalyptic number.

21131431041 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21131431041 is a deficient number, since it is larger than the sum of its proper divisors (11073024767).

21131431041 is a wasteful number, since it uses less digits than its factorization.

21131431041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130632.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21131431041 its reverse (14013413112), we get a palindrome (35144844153).

The spelling of 21131431041 in words is "twenty-one billion, one hundred thirty-one million, four hundred thirty-one thousand, forty-one".