211200000110021 has 4 divisors (see below), whose sum is σ = 227446153964652. Its totient is φ = 194953846255392.

The previous prime is 211200000109993. The next prime is 211200000110087. The reversal of 211200000110021 is 120011000002112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 59035711240900 + 152164288869121 = 7683470^2 + 12335489^2 .

It is a cyclic number.

It is not a de Polignac number, because 211200000110021 - 2¹⁰ = 211200000108997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211200000109984 and 211200000110011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211200000110921) 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, 8123076927296 + ... + 8123076927321.

It is an arithmetic number, because the mean of its divisors is an integer number (56861538491163).

Almost surely, 2^{211200000110021} is an apocalyptic number.

It is an amenable number.

211200000110021 is a deficient number, since it is larger than the sum of its proper divisors (16246153854631).

211200000110021 is a wasteful number, since it uses less digits than its factorization.

211200000110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16246153854630.

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

Adding to 211200000110021 its reverse (120011000002112), we get a palindrome (331211000112133).

The spelling of 211200000110021 in words is "two hundred eleven trillion, two hundred billion, one hundred ten thousand, twenty-one".