21021321002 has 64 divisors (see below), whose sum is σ = 36158400000. Its totient is φ = 9077967360.

The previous prime is 21021321001. The next prime is 21021321037. The reversal of 21021321002 is 20012312012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21021321001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13570124 + ... + 13571672.

It is an arithmetic number, because the mean of its divisors is an integer number (564975000).

Almost surely, 2^21021321002 is an apocalyptic number.

21021321002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21021321002 is a deficient number, since it is larger than the sum of its proper divisors (15137078998).

21021321002 is a wasteful number, since it uses less digits than its factorization.

21021321002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1919.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21021321002 its reverse (20012312012), we get a palindrome (41033633014).

The spelling of 21021321002 in words is "twenty-one billion, twenty-one million, three hundred twenty-one thousand, two".