210021200000111 has 4 divisors (see below), whose sum is σ = 210021230891472. Its totient is φ = 210021169108752.

The previous prime is 210021200000081. The next prime is 210021200000147. The reversal of 210021200000111 is 111000002120012.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 210021200000111 - 2³⁸ = 209746322093167 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210021200000092 and 210021200000101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210021200000611) 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, 291686 + ... + 20497011.

It is an arithmetic number, because the mean of its divisors is an integer number (52505307722868).

Almost surely, 2^{210021200000111} is an apocalyptic number.

210021200000111 is a deficient number, since it is larger than the sum of its proper divisors (30891361).

210021200000111 is a wasteful number, since it uses less digits than its factorization.

210021200000111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30891360.

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

Adding to 210021200000111 its reverse (111000002120012), we get a palindrome (321021202120123).

The spelling of 210021200000111 in words is "two hundred ten trillion, twenty-one billion, two hundred million, one hundred eleven", and thus it is an aban number.