1221211011010 has 32 divisors (see below), whose sum is σ = 2259960639552. Its totient is φ = 474863014080.

The previous prime is 1221211011001. The next prime is 1221211011019. The reversal of 1221211011010 is 101101121221.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1221211011001) and next prime (1221211011019).

It is not an unprimeable number, because it can be changed into a prime (1221211011019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6639189 + ... + 6820648.

It is an arithmetic number, because the mean of its divisors is an integer number (70623769986).

Almost surely, 2^{1221211011010} is an apocalyptic number.

1221211011010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221211011010 is a deficient number, since it is larger than the sum of its proper divisors (1038749628542).

1221211011010 is a wasteful number, since it uses less digits than its factorization.

1221211011010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13460098.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1221211011010 its reverse (101101121221), we get a palindrome (1322312132231).

The spelling of 1221211011010 in words is "one trillion, two hundred twenty-one billion, two hundred eleven million, eleven thousand, ten".