1211101111010 has 16 divisors (see below), whose sum is σ = 2491407999936. Its totient is φ = 415234666608.

The previous prime is 1211101110977. The next prime is 1211101111123. The reversal of 1211101111010 is 101111011121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1211101110982 and 1211101111000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8650722152 + ... + 8650722291.

It is an arithmetic number, because the mean of its divisors is an integer number (155712999996).

Almost surely, 2^{1211101111010} is an apocalyptic number.

1211101111010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211101111010 is an abundant number, since it is smaller than the sum of its proper divisors (1280306888926).

1211101111010 is a wasteful number, since it uses less digits than its factorization.

1211101111010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17301444457.

The product of its (nonzero) digits is 2, while the sum is 11.

Adding to 1211101111010 its reverse (101111011121), we get a palindrome (1312212122131).

It can be divided in two parts, 121110111 and 1010, that added together give a palindrome (121111121).

The spelling of 1211101111010 in words is "one trillion, two hundred eleven billion, one hundred one million, one hundred eleven thousand, ten".