101220001221 has 24 divisors (see below), whose sum is σ = 136933207936. Its totient is φ = 66507143040.

The previous prime is 101220001151. The next prime is 101220001241. The reversal of 101220001221 is 122100022101.

It is not a de Polignac number, because 101220001221 - 2⁷ = 101220001093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101220001197 and 101220001206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101220001241) 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 23 ways as a sum of consecutive naturals, for example, 8943156 + ... + 8954466.

Almost surely, 2^101220001221 is an apocalyptic number.

It is an amenable number.

101220001221 is a deficient number, since it is larger than the sum of its proper divisors (35713206715).

101220001221 is an equidigital number, since it uses as much as digits as its factorization.

101220001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11913 (or 11830 counting only the distinct ones).

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

Adding to 101220001221 its reverse (122100022101), we get a palindrome (223320023322).

The spelling of 101220001221 in words is "one hundred one billion, two hundred twenty million, one thousand, two hundred twenty-one".