21001100022111 has 32 divisors (see below), whose sum is σ = 30611053668096. Its totient is φ = 12701301056000.

The previous prime is 21001100022079. The next prime is 21001100022163. The reversal of 21001100022111 is 11122000110012.

It is a cyclic number.

It is not a de Polignac number, because 21001100022111 - 2⁵ = 21001100022079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001100022191) 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, 29804215 + ... + 30500711.

It is an arithmetic number, because the mean of its divisors is an integer number (956595427128).

Almost surely, 2^{21001100022111} is an apocalyptic number.

21001100022111 is a deficient number, since it is larger than the sum of its proper divisors (9609953645985).

21001100022111 is a wasteful number, since it uses less digits than its factorization.

21001100022111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698423.

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

Adding to 21001100022111 its reverse (11122000110012), we get a palindrome (32123100132123).

The spelling of 21001100022111 in words is "twenty-one trillion, one billion, one hundred million, twenty-two thousand, one hundred eleven".