1221231305001 has 16 divisors (see below), whose sum is σ = 1632743736768. Its totient is φ = 811937472000.

The previous prime is 1221231304981. The next prime is 1221231305039. The reversal of 1221231305001 is 1005031321221.

It is not a de Polignac number, because 1221231305001 - 2¹¹ = 1221231302953 is a prime.

It is a super-2 number, since 2×1221231305001² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2221231305001) 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 15 ways as a sum of consecutive naturals, for example, 5228230 + ... + 5456816.

It is an arithmetic number, because the mean of its divisors is an integer number (102046483548).

Almost surely, 2^{1221231305001} is an apocalyptic number.

It is an amenable number.

1221231305001 is a deficient number, since it is larger than the sum of its proper divisors (411512431767).

1221231305001 is a wasteful number, since it uses less digits than its factorization.

1221231305001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233432.

The product of its (nonzero) digits is 360, while the sum is 21.

Adding to 1221231305001 its reverse (1005031321221), we get a palindrome (2226262626222).

The spelling of 1221231305001 in words is "one trillion, two hundred twenty-one billion, two hundred thirty-one million, three hundred five thousand, one".