21120122002111 has 4 divisors (see below), whose sum is σ = 23040133093224. Its totient is φ = 19200110911000.

The previous prime is 21120122002097. The next prime is 21120122002267. The reversal of 21120122002111 is 11120022102112.

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 21120122002111 - 2⁵ = 21120122002079 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 (21120122000111) 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, 960005545540 + ... + 960005545561.

It is an arithmetic number, because the mean of its divisors is an integer number (5760033273306).

Almost surely, 2^{21120122002111} is an apocalyptic number.

21120122002111 is a deficient number, since it is larger than the sum of its proper divisors (1920011091113).

21120122002111 is a wasteful number, since it uses less digits than its factorization.

21120122002111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1920011091112.

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

Adding to 21120122002111 its reverse (11120022102112), we get a palindrome (32240144104223).

The spelling of 21120122002111 in words is "twenty-one trillion, one hundred twenty billion, one hundred twenty-two million, two thousand, one hundred eleven".