1221000100097 has 8 divisors (see below), whose sum is σ = 1304446298400. Its totient is φ = 1139472205344.

The previous prime is 1221000100091. The next prime is 1221000100121. The reversal of 1221000100097 is 7900010001221.

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 1221000100097 - 2¹⁰ = 1221000099073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221000100091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 479574572 + ... + 479577117.

It is an arithmetic number, because the mean of its divisors is an integer number (163055787300).

Almost surely, 2^{1221000100097} is an apocalyptic number.

It is an amenable number.

1221000100097 is a deficient number, since it is larger than the sum of its proper divisors (83446198303).

1221000100097 is an equidigital number, since it uses as much as digits as its factorization.

1221000100097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 959151775.

The product of its (nonzero) digits is 252, while the sum is 23.

The spelling of 1221000100097 in words is "one trillion, two hundred twenty-one billion, one hundred thousand, ninety-seven".