1221012002195 has 4 divisors (see below), whose sum is σ = 1465214402640. Its totient is φ = 976809601752.

The previous prime is 1221012002167. The next prime is 1221012002213. The reversal of 1221012002195 is 5912002101221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221012002195 - 2¹² = 1221011998099 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122101200215 + ... + 122101200224.

It is an arithmetic number, because the mean of its divisors is an integer number (366303600660).

Almost surely, 2^{1221012002195} is an apocalyptic number.

1221012002195 is a deficient number, since it is larger than the sum of its proper divisors (244202400445).

1221012002195 is an equidigital number, since it uses as much as digits as its factorization.

1221012002195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244202400444.

The product of its (nonzero) digits is 720, while the sum is 26.

The spelling of 1221012002195 in words is "one trillion, two hundred twenty-one billion, twelve million, two thousand, one hundred ninety-five".