1211010111211 has 4 divisors (see below), whose sum is σ = 1219137696000. Its totient is φ = 1202882526424.

The previous prime is 1211010111209. The next prime is 1211010111239. The reversal of 1211010111211 is 1121110101121.

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

It is a cyclic number.

It is not a de Polignac number, because 1211010111211 - 2¹ = 1211010111209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211010111191 and 1211010111200.

It is not an unprimeable number, because it can be changed into a prime (1211010111271) 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, 4063792171 + ... + 4063792468.

It is an arithmetic number, because the mean of its divisors is an integer number (304784424000).

Almost surely, 2^{1211010111211} is an apocalyptic number.

1211010111211 is a deficient number, since it is larger than the sum of its proper divisors (8127584789).

1211010111211 is an equidigital number, since it uses as much as digits as its factorization.

1211010111211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8127584788.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 1211010111211 its reverse (1121110101121), we get a palindrome (2332120212332).

The spelling of 1211010111211 in words is "one trillion, two hundred eleven billion, ten million, one hundred eleven thousand, two hundred eleven".