1221220120010 has 16 divisors (see below), whose sum is σ = 2398032235872. Its totient is φ = 444080043600.

The previous prime is 1221220119997. The next prime is 1221220120027. The reversal of 1221220120010 is 100210221221.

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, 5551000436 + ... + 5551000655.

It is an arithmetic number, because the mean of its divisors is an integer number (149877014742).

Almost surely, 2^{1221220120010} is an apocalyptic number.

1221220120010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221220120010 is a deficient number, since it is larger than the sum of its proper divisors (1176812115862).

1221220120010 is a wasteful number, since it uses less digits than its factorization.

1221220120010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11102001109.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1221220120010 its reverse (100210221221), we get a palindrome (1321430341231).

The spelling of 1221220120010 in words is "one trillion, two hundred twenty-one billion, two hundred twenty million, one hundred twenty thousand, ten".