21011002022111 has 4 divisors (see below), whose sum is σ = 21047416237632. Its totient is φ = 20974587806592.

The previous prime is 21011002022077. The next prime is 21011002022117. The reversal of 21011002022111 is 11122020011012.

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

It is a cyclic number.

It is not a de Polignac number, because 21011002022111 - 2⁴² = 16612955511007 is a prime.

It is a super-3 number, since 3×21011002022111³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011002022117) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 18207106895 + ... + 18207108048.

It is an arithmetic number, because the mean of its divisors is an integer number (5261854059408).

Almost surely, 2^{21011002022111} is an apocalyptic number.

21011002022111 is a deficient number, since it is larger than the sum of its proper divisors (36414215521).

21011002022111 is an equidigital number, since it uses as much as digits as its factorization.

21011002022111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36414215520.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21011002022111 its reverse (11122020011012), we get a palindrome (32133022033123).

The spelling of 21011002022111 in words is "twenty-one trillion, eleven billion, two million, twenty-two thousand, one hundred eleven".