1221020231001 has 8 divisors (see below), whose sum is σ = 1644810758304. Its totient is φ = 805621595520.

The previous prime is 1221020230957. The next prime is 1221020231009. The reversal of 1221020231001 is 1001320201221.

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

It is not a de Polignac number, because 1221020231001 - 2¹⁹ = 1221019706713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221020231009) 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, 2097972615 + ... + 2097973196.

It is an arithmetic number, because the mean of its divisors is an integer number (205601344788).

Almost surely, 2^{1221020231001} is an apocalyptic number.

It is an amenable number.

1221020231001 is a deficient number, since it is larger than the sum of its proper divisors (423790527303).

1221020231001 is an equidigital number, since it uses as much as digits as its factorization.

1221020231001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4195945911.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 1221020231001 its reverse (1001320201221), we get a palindrome (2222340432222).

The spelling of 1221020231001 in words is "one trillion, two hundred twenty-one billion, twenty million, two hundred thirty-one thousand, one".