211100120021 has 16 divisors (see below), whose sum is σ = 250711219200. Its totient is φ = 173930855040.

The previous prime is 211100119991. The next prime is 211100120051. The reversal of 211100120021 is 120021001112.

It is an interprime number because it is at equal distance from previous prime (211100119991) and next prime (211100120051).

It is a cyclic number.

It is not a de Polignac number, because 211100120021 - 2⁶ = 211100119957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211100119984 and 211100120011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211100120051) 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, 3232136 + ... + 3296801.

It is an arithmetic number, because the mean of its divisors is an integer number (15669451200).

Almost surely, 2^211100120021 is an apocalyptic number.

It is an amenable number.

211100120021 is a deficient number, since it is larger than the sum of its proper divisors (39611099179).

211100120021 is a wasteful number, since it uses less digits than its factorization.

211100120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6529124.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 211100120021 its reverse (120021001112), we get a palindrome (331121121133).

The spelling of 211100120021 in words is "two hundred eleven billion, one hundred million, one hundred twenty thousand, twenty-one".