21131002203030 has 96 divisors (see below), whose sum is σ = 58181318997984. Its totient is φ = 5302654645248.

The previous prime is 21131002203007. The next prime is 21131002203043. The reversal of 21131002203030 is 3030220013112.

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

It is a junction number, because it is equal to n+sod(n) for n = 21131002202994 and 21131002203012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8962144 + ... + 11071676.

It is an arithmetic number, because the mean of its divisors is an integer number (606055406229).

Almost surely, 2^{21131002203030} is an apocalyptic number.

21131002203030 is an abundant number, since it is smaller than the sum of its proper divisors (37050316794954).

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

21131002203030 is a wasteful number, since it uses less digits than its factorization.

21131002203030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2116110 (or 2116107 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21131002203030 its reverse (3030220013112), we get a palindrome (24161222216142).

The spelling of 21131002203030 in words is "twenty-one trillion, one hundred thirty-one billion, two million, two hundred three thousand, thirty".