21111200021002 has 64 divisors (see below), whose sum is σ = 39418707283200. Its totient is φ = 8256531064320.

The previous prime is 21111200020987. The next prime is 21111200021033. The reversal of 21111200021002 is 20012000211112.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 105040824 + ... + 105241612.

It is an arithmetic number, because the mean of its divisors is an integer number (615917301300).

Almost surely, 2^{21111200021002} is an apocalyptic number.

21111200021002 is a deficient number, since it is larger than the sum of its proper divisors (18307507262198).

21111200021002 is a wasteful number, since it uses less digits than its factorization.

21111200021002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207391.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21111200021002 its reverse (20012000211112), we get a palindrome (41123200232114).

The spelling of 21111200021002 in words is "twenty-one trillion, one hundred eleven billion, two hundred million, twenty-one thousand, two".