21002102001111 has 32 divisors (see below), whose sum is σ = 35764111627776. Its totient is φ = 10644080832000.

The previous prime is 21002102001061. The next prime is 21002102001113. The reversal of 21002102001111 is 11110020120012.

It is not a de Polignac number, because 21002102001111 - 2³⁰ = 21001028259287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002102001113) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1108748950 + ... + 1108767891.

It is an arithmetic number, because the mean of its divisors is an integer number (1117628488368).

Almost surely, 2^{21002102001111} is an apocalyptic number.

21002102001111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21002102001111 is a deficient number, since it is larger than the sum of its proper divisors (14762009626665).

21002102001111 is a wasteful number, since it uses less digits than its factorization.

21002102001111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2217516903.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21002102001111 its reverse (11110020120012), we get a palindrome (32112122121123).

The spelling of 21002102001111 in words is "twenty-one trillion, two billion, one hundred two million, one thousand, one hundred eleven".