1221033101001 has 16 divisors (see below), whose sum is σ = 1860840038400. Its totient is φ = 697651386768.

The previous prime is 1221033100999. The next prime is 1221033101009. The reversal of 1221033101001 is 1001013301221.

It is a happy number.

It is not a de Polignac number, because 1221033101001 - 2¹ = 1221033100999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221033101009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3225321 + ... + 3583958.

It is an arithmetic number, because the mean of its divisors is an integer number (116302502400).

Almost surely, 2^{1221033101001} is an apocalyptic number.

It is an amenable number.

1221033101001 is a deficient number, since it is larger than the sum of its proper divisors (639806937399).

1221033101001 is an equidigital number, since it uses as much as digits as its factorization.

1221033101001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6817828.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 1221033101001 its reverse (1001013301221), we get a palindrome (2222046402222).

The spelling of 1221033101001 in words is "one trillion, two hundred twenty-one billion, thirty-three million, one hundred one thousand, one".