21331221002 has 96 divisors (see below), whose sum is σ = 42695880192. Its totient is φ = 7753047552.

The previous prime is 21331220983. The next prime is 21331221031. The reversal of 21331221002 is 20012213312.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 47 ways as a sum of consecutive naturals, for example, 55694903 + ... + 55695285.

It is an arithmetic number, because the mean of its divisors is an integer number (444748752).

Almost surely, 2^21331221002 is an apocalyptic number.

21331221002 is an abundant number, since it is smaller than the sum of its proper divisors (21364659190).

21331221002 is a wasteful number, since it uses less digits than its factorization.

21331221002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852 (or 469 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21331221002 its reverse (20012213312), we get a palindrome (41343434314).

The spelling of 21331221002 in words is "twenty-one billion, three hundred thirty-one million, two hundred twenty-one thousand, two".