1221101022001 has 16 divisors (see below), whose sum is σ = 1426346029440. Its totient is φ = 1023748231680.

The previous prime is 1221101021981. The next prime is 1221101022047. The reversal of 1221101022001 is 1002201011221.

It is a cyclic number.

It is not a de Polignac number, because 1221101022001 - 2²⁵ = 1221067467569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221101022091) 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, 7911616 + ... + 8064481.

It is an arithmetic number, because the mean of its divisors is an integer number (89146626840).

Almost surely, 2^{1221101022001} is an apocalyptic number.

It is an amenable number.

1221101022001 is a deficient number, since it is larger than the sum of its proper divisors (205245007439).

1221101022001 is a wasteful number, since it uses less digits than its factorization.

1221101022001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15976344.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1221101022001 its reverse (1002201011221), we get a palindrome (2223302033222).

The spelling of 1221101022001 in words is "one trillion, two hundred twenty-one billion, one hundred one million, twenty-two thousand, one".