21100324031 has 4 divisors (see below), whose sum is σ = 21100618200. Its totient is φ = 21100029864.

The previous prime is 21100323997. The next prime is 21100324051. The reversal of 21100324031 is 13042300112.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21100324031 - 2²² = 21096129727 is a prime.

It is a super-2 number, since 2×21100324031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100324051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38900 + ... + 209078.

It is an arithmetic number, because the mean of its divisors is an integer number (5275154550).

Almost surely, 2^21100324031 is an apocalyptic number.

21100324031 is a deficient number, since it is larger than the sum of its proper divisors (294169).

21100324031 is a wasteful number, since it uses less digits than its factorization.

21100324031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294168.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21100324031 its reverse (13042300112), we get a palindrome (34142624143).

The spelling of 21100324031 in words is "twenty-one billion, one hundred million, three hundred twenty-four thousand, thirty-one".