210012121111 has 16 divisors (see below), whose sum is σ = 239722356384. Its totient is φ = 182262334464.

The previous prime is 210012121093. The next prime is 210012121133. The reversal of 210012121111 is 111121210012.

It is a happy number.

It is not a de Polignac number, because 210012121111 - 2⁵ = 210012121079 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210012121091 and 210012121100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210012121171) 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, 287961 + ... + 709186.

It is an arithmetic number, because the mean of its divisors is an integer number (14982647274).

Almost surely, 2^210012121111 is an apocalyptic number.

210012121111 is a deficient number, since it is larger than the sum of its proper divisors (29710235273).

210012121111 is a wasteful number, since it uses less digits than its factorization.

210012121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 998130.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 210012121111 its reverse (111121210012), we get a palindrome (321133331123).

The spelling of 210012121111 in words is "two hundred ten billion, twelve million, one hundred twenty-one thousand, one hundred eleven".