21131103132 has 36 divisors (see below), whose sum is σ = 54058291560. Its totient is φ = 6958836192.

The previous prime is 21131103121. The next prime is 21131103179. The reversal of 21131103132 is 23130113112.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 3533007 + ... + 3538982.

It is an arithmetic number, because the mean of its divisors is an integer number (1501619210).

Almost surely, 2^21131103132 is an apocalyptic number.

It is an amenable number.

21131103132 is an abundant number, since it is smaller than the sum of its proper divisors (32927188428).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21131103132 is a wasteful number, since it uses less digits than its factorization.

21131103132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7072082 (or 7072077 counting only the distinct ones).

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

Adding to 21131103132 its reverse (23130113112), we get a palindrome (44261216244).

The spelling of 21131103132 in words is "twenty-one billion, one hundred thirty-one million, one hundred three thousand, one hundred thirty-two".