211100000021 has 8 divisors (see below), whose sum is σ = 213784682880. Its totient is φ = 208415630592.

The previous prime is 211100000017. The next prime is 211100000039. The reversal of 211100000021 is 120000001112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211100000021 - 2² = 211100000017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211099999954 and 211100000008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211100002021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1470581 + ... + 1607733.

It is an arithmetic number, because the mean of its divisors is an integer number (26723085360).

Almost surely, 2^211100000021 is an apocalyptic number.

It is an amenable number.

211100000021 is a deficient number, since it is larger than the sum of its proper divisors (2684682859).

211100000021 is a wasteful number, since it uses less digits than its factorization.

211100000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156715.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 211100000021 its reverse (120000001112), we get a palindrome (331100001133).

The spelling of 211100000021 in words is "two hundred eleven billion, one hundred million, twenty-one", and thus it is an aban number.