21122111020111 has 8 divisors (see below), whose sum is σ = 21142525996944. Its totient is φ = 21101696649600.

The previous prime is 21122111020079. The next prime is 21122111020117. The reversal of 21122111020111 is 11102011122112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21122111020111 - 2⁵ = 21122111020079 is a prime.

It is a super-2 number, since 2×21122111020111² (a number of 27 digits) contains 22 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 (21122111020117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103839141 + ... + 104042353.

It is an arithmetic number, because the mean of its divisors is an integer number (2642815749618).

Almost surely, 2^{21122111020111} is an apocalyptic number.

21122111020111 is a deficient number, since it is larger than the sum of its proper divisors (20414976833).

21122111020111 is a wasteful number, since it uses less digits than its factorization.

21122111020111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303161.

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

Adding to 21122111020111 its reverse (11102011122112), we get a palindrome (32224122142223).

The spelling of 21122111020111 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred eleven million, twenty thousand, one hundred eleven".