21101120111021 has 32 divisors (see below), whose sum is σ = 22506931019520. Its totient is φ = 19740941789184.

The previous prime is 21101120111011. The next prime is 21101120111033. The reversal of 21101120111021 is 12011102110112.

It is a cyclic number.

It is not a de Polignac number, because 21101120111021 - 2⁶ = 21101120110957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21101120110987 and 21101120111005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101120111011) 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, 219163790 + ... + 219260048.

It is an arithmetic number, because the mean of its divisors is an integer number (703341594360).

Almost surely, 2^{21101120111021} is an apocalyptic number.

It is an amenable number.

21101120111021 is a deficient number, since it is larger than the sum of its proper divisors (1405810908499).

21101120111021 is a wasteful number, since it uses less digits than its factorization.

21101120111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97445.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21101120111021 its reverse (12011102110112), we get a palindrome (33112222221133).

The spelling of 21101120111021 in words is "twenty-one trillion, one hundred one billion, one hundred twenty million, one hundred eleven thousand, twenty-one".