21031002121230 has 128 divisors (see below), whose sum is σ = 56181570762240. Its totient is φ = 5598382394880.

The previous prime is 21031002121187. The next prime is 21031002121243. The reversal of 21031002121230 is 3212120013012.

21031002121230 is a `hidden beast` number, since 2 + 1 + 0 + 310 + 0 + 2 + 121 + 230 = 666.

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 63 ways as a sum of consecutive naturals, for example, 693550849 + ... + 693581171.

It is an arithmetic number, because the mean of its divisors is an integer number (438918521580).

Almost surely, 2^{21031002121230} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21031002121230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28090785381120).

21031002121230 is an abundant number, since it is smaller than the sum of its proper divisors (35150568641010).

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

21031002121230 is a wasteful number, since it uses less digits than its factorization.

21031002121230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34783 (or 34777 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21031002121230 its reverse (3212120013012), we get a palindrome (24243122134242).

The spelling of 21031002121230 in words is "twenty-one trillion, thirty-one billion, two million, one hundred twenty-one thousand, two hundred thirty".