21331231002 has 48 divisors (see below), whose sum is σ = 46366981440. Its totient is φ = 7087481856.

The previous prime is 21331230997. The next prime is 21331231073. The reversal of 21331231002 is 20013213312.

21331231002 is a `hidden beast` number, since 21 + 331 + 2 + 310 + 0 + 2 = 666.

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 (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11351499 + ... + 11353377.

It is an arithmetic number, because the mean of its divisors is an integer number (965978780).

Almost surely, 2^21331231002 is an apocalyptic number.

21331231002 is an abundant number, since it is smaller than the sum of its proper divisors (25035750438).

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

21331231002 is a wasteful number, since it uses less digits than its factorization.

21331231002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3587 (or 3584 counting only the distinct ones).

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

Adding to 21331231002 its reverse (20013213312), we get a palindrome (41344444314).

The spelling of 21331231002 in words is "twenty-one billion, three hundred thirty-one million, two hundred thirty-one thousand, two".