21110102211021 has 32 divisors (see below), whose sum is σ = 28802656512000. Its totient is φ = 13748626375680.

The previous prime is 21110102211013. The next prime is 21110102211043. The reversal of 21110102211021 is 12011220101112.

It is a happy number.

It is not a de Polignac number, because 21110102211021 - 2³ = 21110102211013 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110102211421) 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, 424495060 + ... + 424544786.

It is an arithmetic number, because the mean of its divisors is an integer number (900083016000).

Almost surely, 2^{21110102211021} is an apocalyptic number.

It is an amenable number.

21110102211021 is a deficient number, since it is larger than the sum of its proper divisors (7692554300979).

21110102211021 is a wasteful number, since it uses less digits than its factorization.

21110102211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65509.

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

Adding to 21110102211021 its reverse (12011220101112), we get a palindrome (33121322312133).

The spelling of 21110102211021 in words is "twenty-one trillion, one hundred ten billion, one hundred two million, two hundred eleven thousand, twenty-one".