21175002131 has 8 divisors (see below), whose sum is σ = 21229401600. Its totient is φ = 21120631560.

The previous prime is 21175002113. The next prime is 21175002151. The reversal of 21175002131 is 13120057112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21175002131 is a prime.

It is a super-2 number, since 2×21175002131² (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 = 21175002097 and 21175002106.

It is not an unprimeable number, because it can be changed into a prime (21175002151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2669990 + ... + 2677908.

It is an arithmetic number, because the mean of its divisors is an integer number (2653675200).

Almost surely, 2^21175002131 is an apocalyptic number.

21175002131 is a deficient number, since it is larger than the sum of its proper divisors (54399469).

21175002131 is an equidigital number, since it uses as much as digits as its factorization.

21175002131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14449.

The product of its (nonzero) digits is 420, while the sum is 23.

Adding to 21175002131 its reverse (13120057112), we get a palindrome (34295059243).

The spelling of 21175002131 in words is "twenty-one billion, one hundred seventy-five million, two thousand, one hundred thirty-one".