21120111022101 has 32 divisors (see below), whose sum is σ = 35464658718720. Its totient is φ = 10881202094784.

The previous prime is 21120111022067. The next prime is 21120111022117. The reversal of 21120111022101 is 10122011102112.

It is a happy number.

It is not a de Polignac number, because 21120111022101 - 2⁶ = 21120111022037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120111022301) 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, 899558541 + ... + 899582018.

It is an arithmetic number, because the mean of its divisors is an integer number (1108270584960).

Almost surely, 2^{21120111022101} is an apocalyptic number.

21120111022101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21120111022101 is a deficient number, since it is larger than the sum of its proper divisors (14344547696619).

21120111022101 is a wasteful number, since it uses less digits than its factorization.

21120111022101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1799140625.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21120111022101 its reverse (10122011102112), we get a palindrome (31242122124213).

The spelling of 21120111022101 in words is "twenty-one trillion, one hundred twenty billion, one hundred eleven million, twenty-two thousand, one hundred one".