1221012110020 has 48 divisors (see below), whose sum is σ = 2696779588608. Its totient is φ = 463731914880.

The previous prime is 1221012109979. The next prime is 1221012110023. The reversal of 1221012110020 is 200112101221.

It is not an unprimeable number, because it can be changed into a prime (1221012110023) 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, 18546144 + ... + 18611863.

It is an arithmetic number, because the mean of its divisors is an integer number (56182908096).

Almost surely, 2^{1221012110020} is an apocalyptic number.

1221012110020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221012110020 is an abundant number, since it is smaller than the sum of its proper divisors (1475767478588).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221012110020 is a wasteful number, since it uses less digits than its factorization.

1221012110020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37158100 (or 37158098 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1221012110020 its reverse (200112101221), we get a palindrome (1421124211241).

The spelling of 1221012110020 in words is "one trillion, two hundred twenty-one billion, twelve million, one hundred ten thousand, twenty".