1211020112211 has 128 divisors (see below), whose sum is σ = 2156758302720. Its totient is φ = 586958980608.

The previous prime is 1211020112209. The next prime is 1211020112251. The reversal of 1211020112211 is 1122110201121.

It is a happy number.

It is not a de Polignac number, because 1211020112211 - 2¹ = 1211020112209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211020112251) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 18320526 + ... + 18386508.

It is an arithmetic number, because the mean of its divisors is an integer number (16849674240).

Almost surely, 2^{1211020112211} is an apocalyptic number.

1211020112211 is a deficient number, since it is larger than the sum of its proper divisors (945738190509).

1211020112211 is a wasteful number, since it uses less digits than its factorization.

1211020112211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66145.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1211020112211 its reverse (1122110201121), we get a palindrome (2333130313332).

It can be divided in two parts, 1211020 and 112211, that added together give a palindrome (1323231).

The spelling of 1211020112211 in words is "one trillion, two hundred eleven billion, twenty million, one hundred twelve thousand, two hundred eleven".