1221021020010 has 48 divisors (see below), whose sum is σ = 3221073642528. Its totient is φ = 296005094880.

The previous prime is 1221021019997. The next prime is 1221021020017. The reversal of 1221021020010 is 100201201221.

It is not an unprimeable number, because it can be changed into a prime (1221021020017) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 168181084 + ... + 168188343.

It is an arithmetic number, because the mean of its divisors is an integer number (67105700886).

Almost surely, 2^{1221021020010} is an apocalyptic number.

1221021020010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221021020010 is an abundant number, since it is smaller than the sum of its proper divisors (2000052622518).

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

1221021020010 is a wasteful number, since it uses less digits than its factorization.

1221021020010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336369459 (or 336369448 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1221021020010 its reverse (100201201221), we get a palindrome (1321222221231).

The spelling of 1221021020010 in words is "one trillion, two hundred twenty-one billion, twenty-one million, twenty thousand, ten".