20110211100021 has 24 divisors (see below), whose sum is σ = 32832997718880. Its totient is φ = 10886730819552.

The previous prime is 20110211099977. The next prime is 20110211100037. The reversal of 20110211100021 is 12000111201102.

It is not a de Polignac number, because 20110211100021 - 2¹⁹ = 20110210575733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20110211110021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3600106606 + ... + 3600112191.

It is an arithmetic number, because the mean of its divisors is an integer number (1368041571620).

Almost surely, 2^{20110211100021} is an apocalyptic number.

20110211100021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20110211100021 is a deficient number, since it is larger than the sum of its proper divisors (12722786618859).

20110211100021 is a wasteful number, since it uses less digits than its factorization.

20110211100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7200218833 (or 7200218826 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20110211100021 its reverse (12000111201102), we get a palindrome (32110322301123).

The spelling of 20110211100021 in words is "twenty trillion, one hundred ten billion, two hundred eleven million, one hundred thousand, twenty-one".