21110201120021 has 16 divisors (see below), whose sum is σ = 22829746356480. Its totient is φ = 19404328991040.

The previous prime is 21110201119999. The next prime is 21110201120039. The reversal of 21110201120021 is 12002110201112.

It is a cyclic number.

It is not a de Polignac number, because 21110201120021 - 2¹⁸ = 21110200857877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21110201119978 and 21110201120005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110201120051) 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, 215865866 + ... + 215963636.

It is an arithmetic number, because the mean of its divisors is an integer number (1426859147280).

Almost surely, 2^{21110201120021} is an apocalyptic number.

It is an amenable number.

21110201120021 is a deficient number, since it is larger than the sum of its proper divisors (1719545236459).

21110201120021 is a wasteful number, since it uses less digits than its factorization.

21110201120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167516.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21110201120021 its reverse (12002110201112), we get a palindrome (33112311321133).

The spelling of 21110201120021 in words is "twenty-one trillion, one hundred ten billion, two hundred one million, one hundred twenty thousand, twenty-one".