21131103102 has 8 divisors (see below), whose sum is σ = 42262206216. Its totient is φ = 7043701032.

The previous prime is 21131103089. The next prime is 21131103107. The reversal of 21131103102 is 20130113112.

It is a happy number.

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

21131103102 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131103107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1760925253 + ... + 1760925264.

It is an arithmetic number, because the mean of its divisors is an integer number (5282775777).

Almost surely, 2^21131103102 is an apocalyptic number.

21131103102 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21131103102 is a wasteful number, since it uses less digits than its factorization.

21131103102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3521850522.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21131103102 its reverse (20130113112), we get a palindrome (41261216214).

The spelling of 21131103102 in words is "twenty-one billion, one hundred thirty-one million, one hundred three thousand, one hundred two".