1221001211195 has 16 divisors (see below), whose sum is σ = 1553343483648. Its totient is φ = 919742843520.

The previous prime is 1221001211191. The next prime is 1221001211231. The reversal of 1221001211195 is 5911121001221.

It is not a de Polignac number, because 1221001211195 - 2² = 1221001211191 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221001211191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106445984 + ... + 106457453.

It is an arithmetic number, because the mean of its divisors is an integer number (97083967728).

Almost surely, 2^{1221001211195} is an apocalyptic number.

1221001211195 is a deficient number, since it is larger than the sum of its proper divisors (332342272453).

1221001211195 is a wasteful number, since it uses less digits than its factorization.

1221001211195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212903510.

The product of its (nonzero) digits is 360, while the sum is 26.

The spelling of 1221001211195 in words is "one trillion, two hundred twenty-one billion, one million, two hundred eleven thousand, one hundred ninety-five".