21201122002111 has 16 divisors (see below), whose sum is σ = 21435606095904. Its totient is φ = 20966968940544.

The previous prime is 21201122002051. The next prime is 21201122002127. The reversal of 21201122002111 is 11120022110212.

It is a cyclic number.

It is not a de Polignac number, because 21201122002111 - 2¹⁵ = 21201121969343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201122002211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 797111265 + ... + 797137861.

It is an arithmetic number, because the mean of its divisors is an integer number (1339725380994).

Almost surely, 2^{21201122002111} is an apocalyptic number.

21201122002111 is a deficient number, since it is larger than the sum of its proper divisors (234484093793).

21201122002111 is a wasteful number, since it uses less digits than its factorization.

21201122002111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32490.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21201122002111 its reverse (11120022110212), we get a palindrome (32321144112323).

The spelling of 21201122002111 in words is "twenty-one trillion, two hundred one billion, one hundred twenty-two million, two thousand, one hundred eleven".