211101100021 has 4 divisors (see below), whose sum is σ = 241258400032. Its totient is φ = 180943800012.

The previous prime is 211101099983. The next prime is 211101100051. The reversal of 211101100021 is 120001101112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 211101100021 - 2⁹ = 211101099509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211101099980 and 211101100007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211101100051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15078649995 + ... + 15078650008.

It is an arithmetic number, because the mean of its divisors is an integer number (60314600008).

Almost surely, 2^211101100021 is an apocalyptic number.

It is an amenable number.

211101100021 is a deficient number, since it is larger than the sum of its proper divisors (30157300011).

211101100021 is an equidigital number, since it uses as much as digits as its factorization.

211101100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30157300010.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 211101100021 its reverse (120001101112), we get a palindrome (331102201133).

The spelling of 211101100021 in words is "two hundred eleven billion, one hundred one million, one hundred thousand, twenty-one".