21531430330004 has 24 divisors (see below), whose sum is σ = 43112759735808. Its totient is φ = 9217063196640.

The previous prime is 21531430329989. The next prime is 21531430330019. The reversal of 21531430330004 is 40003303413512.

It is an interprime number because it is at equal distance from previous prime (21531430329989) and next prime (21531430330019).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 445502867 + ... + 445551194.

It is an arithmetic number, because the mean of its divisors is an integer number (1796364988992).

Almost surely, 2^{21531430330004} is an apocalyptic number.

It is an amenable number.

21531430330004 is an abundant number, since it is smaller than the sum of its proper divisors (21581329405804).

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

21531430330004 is a wasteful number, since it uses less digits than its factorization.

21531430330004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891054935 (or 891054933 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 29.

Adding to 21531430330004 its reverse (40003303413512), we get a palindrome (61534733743516).

The spelling of 21531430330004 in words is "twenty-one trillion, five hundred thirty-one billion, four hundred thirty million, three hundred thirty thousand, four".