1221012001101 has 16 divisors (see below), whose sum is σ = 1637328896000. Its totient is φ = 809357213808.

The previous prime is 1221012001087. The next prime is 1221012001141. The reversal of 1221012001101 is 1011002101221.

It is not a de Polignac number, because 1221012001101 - 2⁷ = 1221012000973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221012001141) 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, 157140 + ... + 1570578.

It is an arithmetic number, because the mean of its divisors is an integer number (102333056000).

Almost surely, 2^{1221012001101} is an apocalyptic number.

It is an amenable number.

1221012001101 is a deficient number, since it is larger than the sum of its proper divisors (416316894899).

1221012001101 is a wasteful number, since it uses less digits than its factorization.

1221012001101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1415088.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1221012001101 its reverse (1011002101221), we get a palindrome (2232014102322).

The spelling of 1221012001101 in words is "one trillion, two hundred twenty-one billion, twelve million, one thousand, one hundred one".