21120100120002 has 16 divisors (see below), whose sum is σ = 45489446412480. Its totient is φ = 6498492344592.

The previous prime is 21120100120001. The next prime is 21120100120033. The reversal of 21120100120002 is 20002100102112.

It is a self number, because there is not a number n which added to its sum of digits gives 21120100120002.

It is not an unprimeable number, because it can be changed into a prime (21120100120001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135385257102 + ... + 135385257257.

It is an arithmetic number, because the mean of its divisors is an integer number (2843090400780).

Almost surely, 2^{21120100120002} is an apocalyptic number.

21120100120002 is an abundant number, since it is smaller than the sum of its proper divisors (24369346292478).

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

21120100120002 is a wasteful number, since it uses less digits than its factorization.

21120100120002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270770514377.

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

Adding to 21120100120002 its reverse (20002100102112), we get a palindrome (41122200222114).

The spelling of 21120100120002 in words is "twenty-one trillion, one hundred twenty billion, one hundred million, one hundred twenty thousand, two".