1211111011010 has 32 divisors (see below), whose sum is σ = 2295069474240. Its totient is φ = 458880766272.

The previous prime is 1211111010917. The next prime is 1211111011051. The reversal of 1211111011010 is 101101111121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1211111010982 and 1211111011000.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 861152 + ... + 1778708.

It is an arithmetic number, because the mean of its divisors is an integer number (71720921070).

Almost surely, 2^{1211111011010} is an apocalyptic number.

1211111011010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211111011010 is a deficient number, since it is larger than the sum of its proper divisors (1083958463230).

1211111011010 is a wasteful number, since it uses less digits than its factorization.

1211111011010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924530.

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

Adding to 1211111011010 its reverse (101101111121), we get a palindrome (1312212122131).

The spelling of 1211111011010 in words is "one trillion, two hundred eleven billion, one hundred eleven million, eleven thousand, ten".