1221002210001 has 64 divisors (see below), whose sum is σ = 1913166848000. Its totient is φ = 692352360000.

The previous prime is 1221002209981. The next prime is 1221002210011. The reversal of 1221002210001 is 1000122001221.

It is not a de Polignac number, because 1221002210001 - 2⁵ = 1221002209969 is a prime.

It is a super-2 number, since 2×1221002210001² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221002210011) 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 63 ways as a sum of consecutive naturals, for example, 166096476 + ... + 166103826.

It is an arithmetic number, because the mean of its divisors is an integer number (29893232000).

Almost surely, 2^{1221002210001} is an apocalyptic number.

It is an amenable number.

1221002210001 is a deficient number, since it is larger than the sum of its proper divisors (692164637999).

1221002210001 is a wasteful number, since it uses less digits than its factorization.

1221002210001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8595 (or 8581 counting only the distinct ones).

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

Adding to 1221002210001 its reverse (1000122001221), we get a palindrome (2221124211222).

The spelling of 1221002210001 in words is "one trillion, two hundred twenty-one billion, two million, two hundred ten thousand, one".