21021110002111 has 4 divisors (see below), whose sum is σ = 21023358499000. Its totient is φ = 21018861505224.

The previous prime is 21021110002063. The next prime is 21021110002157. The reversal of 21021110002111 is 11120001112012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21021110002111 is a prime.

It is a super-2 number, since 2×21021110002111² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21021110002091 and 21021110002100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021110062111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1124234421 + ... + 1124253118.

It is an arithmetic number, because the mean of its divisors is an integer number (5255839624750).

Almost surely, 2^{21021110002111} is an apocalyptic number.

21021110002111 is a deficient number, since it is larger than the sum of its proper divisors (2248496889).

21021110002111 is an equidigital number, since it uses as much as digits as its factorization.

21021110002111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2248496888.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21021110002111 its reverse (11120001112012), we get a palindrome (32141111114123).

The spelling of 21021110002111 in words is "twenty-one trillion, twenty-one billion, one hundred ten million, two thousand, one hundred eleven".