1221020102001 has 8 divisors (see below), whose sum is σ = 1860602060224. Its totient is φ = 697725772560.

The previous prime is 1221020101999. The next prime is 1221020102017. The reversal of 1221020102001 is 1002010201221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1221020102001 - 2¹ = 1221020101999 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1221020102051) 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, 29071907170 + ... + 29071907211.

It is an arithmetic number, because the mean of its divisors is an integer number (232575257528).

Almost surely, 2^{1221020102001} is an apocalyptic number.

It is an amenable number.

1221020102001 is a deficient number, since it is larger than the sum of its proper divisors (639581958223).

1221020102001 is an equidigital number, since it uses as much as digits as its factorization.

1221020102001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58143814391.

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

Adding to 1221020102001 its reverse (1002010201221), we get a palindrome (2223030303222).

The spelling of 1221020102001 in words is "one trillion, two hundred twenty-one billion, twenty million, one hundred two thousand, one".