1221001110101 has 8 divisors (see below), whose sum is σ = 1294974806784. Its totient is φ = 1148767971120.

The previous prime is 1221001110089. The next prime is 1221001110107. The reversal of 1221001110101 is 1010111001221.

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 1221001110101 - 2²⁶ = 1220934001237 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 (1221001110107) 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, 435137981 + ... + 435140786.

It is an arithmetic number, because the mean of its divisors is an integer number (161871850848).

Almost surely, 2^{1221001110101} is an apocalyptic number.

It is an amenable number.

1221001110101 is a deficient number, since it is larger than the sum of its proper divisors (73973696683).

1221001110101 is an equidigital number, since it uses as much as digits as its factorization.

1221001110101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870278851.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 1221001110101 its reverse (1010111001221), we get a palindrome (2231112111322).

The spelling of 1221001110101 in words is "one trillion, two hundred twenty-one billion, one million, one hundred ten thousand, one hundred one".