1221100012010 has 16 divisors (see below), whose sum is σ = 2293544370816. Its totient is φ = 467203482768.

The previous prime is 1221100012003. The next prime is 1221100012021. The reversal of 1221100012010 is 102100011221.

It is a junction number, because it is equal to n+sod(n) for n = 1221100011982 and 1221100012000.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2654565014 + ... + 2654565473.

It is an arithmetic number, because the mean of its divisors is an integer number (143346523176).

Almost surely, 2^{1221100012010} is an apocalyptic number.

1221100012010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221100012010 is a deficient number, since it is larger than the sum of its proper divisors (1072444358806).

1221100012010 is a wasteful number, since it uses less digits than its factorization.

1221100012010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5309130517.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1221100012010 its reverse (102100011221), we get a palindrome (1323200023231).

The spelling of 1221100012010 in words is "one trillion, two hundred twenty-one billion, one hundred million, twelve thousand, ten".