1220001100101 has 48 divisors (see below), whose sum is σ = 2089037149056. Its totient is φ = 671602917888.

The previous prime is 1220001100099. The next prime is 1220001100121. The reversal of 1220001100101 is 1010011000221.

It is a happy number.

It is not a de Polignac number, because 1220001100101 - 2¹ = 1220001100099 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220001100121) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2886840 + ... + 3282353.

It is an arithmetic number, because the mean of its divisors is an integer number (43521607272).

Almost surely, 2^{1220001100101} is an apocalyptic number.

It is an amenable number.

1220001100101 is a deficient number, since it is larger than the sum of its proper divisors (869036048955).

1220001100101 is a wasteful number, since it uses less digits than its factorization.

1220001100101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6169322 (or 6169319 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 1220001100101 its reverse (1010011000221), we get a palindrome (2230012100322).

The spelling of 1220001100101 in words is "one trillion, two hundred twenty billion, one million, one hundred thousand, one hundred one".