1221012110101 has 8 divisors (see below), whose sum is σ = 1399329440640. Its totient is φ = 1043666536848.

The previous prime is 1221012110033. The next prime is 1221012110183. The reversal of 1221012110101 is 1010112101221.

It is a happy number.

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 1221012110101 - 2⁷ = 1221012109973 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 (1221012110501) 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, 242936626 + ... + 242941651.

It is an arithmetic number, because the mean of its divisors is an integer number (174916180080).

Almost surely, 2^{1221012110101} is an apocalyptic number.

It is an amenable number.

1221012110101 is a deficient number, since it is larger than the sum of its proper divisors (178317330539).

1221012110101 is an equidigital number, since it uses as much as digits as its factorization.

1221012110101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485878643.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1221012110101 its reverse (1010112101221), we get a palindrome (2231124211322).

The spelling of 1221012110101 in words is "one trillion, two hundred twenty-one billion, twelve million, one hundred ten thousand, one hundred one".