1221220112101 has 8 divisors (see below), whose sum is σ = 1340413376544. Its totient is φ = 1103389056720.

The previous prime is 1221220112083. The next prime is 1221220112107. The reversal of 1221220112101 is 1012110221221.

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

It is a cyclic number.

It is not a de Polignac number, because 1221220112101 - 2⁹ = 1221220111589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221220112107) 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 7 ways as a sum of consecutive naturals, for example, 340550386 + ... + 340553971.

It is an arithmetic number, because the mean of its divisors is an integer number (167551672068).

Almost surely, 2^{1221220112101} is an apocalyptic number.

1221220112101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1221220112101 is a deficient number, since it is larger than the sum of its proper divisors (119193264443).

1221220112101 is a wasteful number, since it uses less digits than its factorization.

1221220112101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681104531.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1221220112101 its reverse (1012110221221), we get a palindrome (2233330333322).

The spelling of 1221220112101 in words is "one trillion, two hundred twenty-one billion, two hundred twenty million, one hundred twelve thousand, one hundred one".