21201100120002 has 64 divisors (see below), whose sum is σ = 47564444534400. Its totient is φ = 6243397678080.

The previous prime is 21201100119989. The next prime is 21201100120027. The reversal of 21201100120002 is 20002100110212.

It is a self number, because there is not a number n which added to its sum of digits gives 21201100120002.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3211927 + ... + 7260762.

It is an arithmetic number, because the mean of its divisors is an integer number (743194445850).

Almost surely, 2^{21201100120002} is an apocalyptic number.

21201100120002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21201100120002 is an abundant number, since it is smaller than the sum of its proper divisors (26363344414398).

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

21201100120002 is a wasteful number, since it uses less digits than its factorization.

21201100120002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10473571.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21201100120002 its reverse (20002100110212), we get a palindrome (41203200230214).

The spelling of 21201100120002 in words is "twenty-one trillion, two hundred one billion, one hundred million, one hundred twenty thousand, two".