21321331002 has 16 divisors (see below), whose sum is σ = 47380735680. Its totient is φ = 7107110316.

The previous prime is 21321330977. The next prime is 21321331091. The reversal of 21321331002 is 20013312312.

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

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, 197419678 + ... + 197419785.

It is an arithmetic number, because the mean of its divisors is an integer number (2961295980).

Almost surely, 2^21321331002 is an apocalyptic number.

21321331002 is an abundant number, since it is smaller than the sum of its proper divisors (26059404678).

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

21321331002 is a wasteful number, since it uses less digits than its factorization.

21321331002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394839474 (or 394839468 counting only the distinct ones).

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

Adding to 21321331002 its reverse (20013312312), we get a palindrome (41334643314).

The spelling of 21321331002 in words is "twenty-one billion, three hundred twenty-one million, three hundred thirty-one thousand, two".