1211111101010 has 8 divisors (see below), whose sum is σ = 2179999981836. Its totient is φ = 484444440400.

The previous prime is 1211111100989. The next prime is 1211111101021. The reversal of 1211111101010 is 101011111121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1097719293841 + 113391807169 = 1047721^2 + 336737^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1211111100982 and 1211111101000.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60555555041 + ... + 60555555060.

Almost surely, 2^{1211111101010} is an apocalyptic number.

1211111101010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211111101010 is a deficient number, since it is larger than the sum of its proper divisors (968888880826).

1211111101010 is a wasteful number, since it uses less digits than its factorization.

1211111101010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121111110108.

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

Adding to 1211111101010 its reverse (101011111121), we get a palindrome (1312122212131).

The spelling of 1211111101010 in words is "one trillion, two hundred eleven billion, one hundred eleven million, one hundred one thousand, ten".