21371310131 has 8 divisors (see below), whose sum is σ = 23019869184. Its totient is φ = 19782698760.

The previous prime is 21371310109. The next prime is 21371310137. The reversal of 21371310131 is 13101317312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21371310131 - 2²² = 21367115827 is a prime.

It is a super-3 number, since 3×21371310131³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21371310097 and 21371310106.

It is not an unprimeable number, because it can be changed into a prime (21371310137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14986181 + ... + 14987606.

It is an arithmetic number, because the mean of its divisors is an integer number (2877483648).

Almost surely, 2^21371310131 is an apocalyptic number.

21371310131 is a deficient number, since it is larger than the sum of its proper divisors (1648559053).

21371310131 is a wasteful number, since it uses less digits than its factorization.

21371310131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29973841.

The product of its (nonzero) digits is 378, while the sum is 23.

Adding to 21371310131 its reverse (13101317312), we get a palindrome (34472627443).

The spelling of 21371310131 in words is "twenty-one billion, three hundred seventy-one million, three hundred ten thousand, one hundred thirty-one".