21002121002002 has 32 divisors (see below), whose sum is σ = 36997730288640. Its totient is φ = 8752662048960.

The previous prime is 21002121001991. The next prime is 21002121002047. The reversal of 21002121002002 is 20020012120012.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10613749 + ... + 12436072.

It is an arithmetic number, because the mean of its divisors is an integer number (1156179071520).

Almost surely, 2^{21002121002002} is an apocalyptic number.

21002121002002 is a deficient number, since it is larger than the sum of its proper divisors (15995609286638).

21002121002002 is a wasteful number, since it uses less digits than its factorization.

21002121002002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23051626.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21002121002002 its reverse (20020012120012), we get a palindrome (41022133122014).

The spelling of 21002121002002 in words is "twenty-one trillion, two billion, one hundred twenty-one million, two thousand, two".