21101002001002 has 48 divisors (see below), whose sum is σ = 40167045136800. Its totient is φ = 8221014194400.

The previous prime is 21101002000987. The next prime is 21101002001003. The reversal of 21101002001002 is 20010020010112.

It is a self number, because there is not a number n which added to its sum of digits gives 21101002001002.

It is not an unprimeable number, because it can be changed into a prime (21101002001003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 68783977 + ... + 69090067.

It is an arithmetic number, because the mean of its divisors is an integer number (836813440350).

Almost surely, 2^{21101002001002} is an apocalyptic number.

21101002001002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21101002001002 is a deficient number, since it is larger than the sum of its proper divisors (19066043135798).

21101002001002 is a wasteful number, since it uses less digits than its factorization.

21101002001002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370067 (or 370060 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21101002001002 its reverse (20010020010112), we get a palindrome (41111022011114).

The spelling of 21101002001002 in words is "twenty-one trillion, one hundred one billion, two million, one thousand, two".