1221020010010 has 16 divisors (see below), whose sum is σ = 2198309875200. Its totient is φ = 488302702416.

The previous prime is 1221020009999. The next prime is 1221020010017. The reversal of 1221020010010 is 100100201221.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (1221020010017) 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 7 ways as a sum of consecutive naturals, for example, 13113990 + ... + 13206769.

It is an arithmetic number, because the mean of its divisors is an integer number (137394367200).

Almost surely, 2^{1221020010010} is an apocalyptic number.

1221020010010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221020010010 is a deficient number, since it is larger than the sum of its proper divisors (977289865190).

1221020010010 is a wasteful number, since it uses less digits than its factorization.

1221020010010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26325405.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1221020010010 its reverse (100100201221), we get a palindrome (1321120211231).

The spelling of 1221020010010 in words is "one trillion, two hundred twenty-one billion, twenty million, ten thousand, ten".