1211020101111 has 32 divisors (see below), whose sum is σ = 1662728760000. Its totient is φ = 783446446080.

The previous prime is 1211020101107. The next prime is 1211020101127. The reversal of 1211020101111 is 1111010201121.

It is not a de Polignac number, because 1211020101111 - 2² = 1211020101107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211020501111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 140664775 + ... + 140673383.

It is an arithmetic number, because the mean of its divisors is an integer number (51960273750).

Almost surely, 2^{1211020101111} is an apocalyptic number.

1211020101111 is a deficient number, since it is larger than the sum of its proper divisors (451708658889).

1211020101111 is a wasteful number, since it uses less digits than its factorization.

1211020101111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11859.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 1211020101111 its reverse (1111010201121), we get a palindrome (2322030302232).

It can be divided in two parts, 1211020 and 101111, that added together give a palindrome (1312131).

The spelling of 1211020101111 in words is "one trillion, two hundred eleven billion, twenty million, one hundred one thousand, one hundred eleven".