21103132131 has 6 divisors (see below), whose sum is σ = 30482301980. Its totient is φ = 14068754748.

The previous prime is 21103132079. The next prime is 21103132139. The reversal of 21103132131 is 13123130112.

It is not a de Polignac number, because 21103132131 - 2¹⁹ = 21102607843 is a prime.

It is a super-2 number, since 2×21103132131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21103132139) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1172396221 + ... + 1172396238.

Almost surely, 2^21103132131 is an apocalyptic number.

21103132131 is a deficient number, since it is larger than the sum of its proper divisors (9379169849).

21103132131 is a wasteful number, since it uses less digits than its factorization.

21103132131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2344792465 (or 2344792462 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21103132131 its reverse (13123130112), we get a palindrome (34226262243).

The spelling of 21103132131 in words is "twenty-one billion, one hundred three million, one hundred thirty-two thousand, one hundred thirty-one".