1221200010101 has 8 divisors (see below), whose sum is σ = 1223290887000. Its totient is φ = 1219110900480.

The previous prime is 1221200010091. The next prime is 1221200010113. The reversal of 1221200010101 is 1010100021221.

It can be written as a sum of positive squares in 4 ways, for example, as 469512744100 + 751687266001 = 685210^2 + 866999^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221200010101 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 (1221200010161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 945095 + ... + 1826363.

It is an arithmetic number, because the mean of its divisors is an integer number (152911360875).

Almost surely, 2^{1221200010101} is an apocalyptic number.

It is an amenable number.

1221200010101 is a deficient number, since it is larger than the sum of its proper divisors (2090876899).

1221200010101 is a wasteful number, since it uses less digits than its factorization.

1221200010101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883639.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1221200010101 its reverse (1010100021221), we get a palindrome (2231300031322).

The spelling of 1221200010101 in words is "one trillion, two hundred twenty-one billion, two hundred million, ten thousand, one hundred one".