21210131021130 has 64 divisors (see below), whose sum is σ = 56561480236800. Its totient is φ = 5655921854400.

The previous prime is 21210131021129. The next prime is 21210131021171. The reversal of 21210131021130 is 3112013101212.

21210131021130 is a `hidden beast` number, since 2 + 12 + 101 + 310 + 211 + 30 = 666.

It is a super-2 number, since 2×21210131021130² (a number of 27 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13204680 + ... + 14723580.

It is an arithmetic number, because the mean of its divisors is an integer number (883773128700).

Almost surely, 2^{21210131021130} is an apocalyptic number.

21210131021130 is an abundant number, since it is smaller than the sum of its proper divisors (35351349215670).

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

21210131021130 is a wasteful number, since it uses less digits than its factorization.

21210131021130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1570636 (or 1570630 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 21210131021130 its reverse (3112013101212), we get a palindrome (24322144122342).

The spelling of 21210131021130 in words is "twenty-one trillion, two hundred ten billion, one hundred thirty-one million, twenty-one thousand, one hundred thirty".