100101221219861 has 2 divisors, whose sum is σ = 100101221219862. Its totient is φ = 100101221219860.

The previous prime is 100101221219849. The next prime is 100101221219887. The reversal of 100101221219861 is 168912122101001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96765959106961 + 3335262112900 = 9836969^2 + 1826270^2 .

It is a cyclic number.

It is not a de Polignac number, because 100101221219861 - 2³⁴ = 100084041350677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100101221219561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50050610609930 + 50050610609931.

It is an arithmetic number, because the mean of its divisors is an integer number (50050610609931).

Almost surely, 2^{100101221219861} is an apocalyptic number.

It is an amenable number.

100101221219861 is a deficient number, since it is larger than the sum of its proper divisors (1).

100101221219861 is an equidigital number, since it uses as much as digits as its factorization.

100101221219861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 35.

The spelling of 100101221219861 in words is "one hundred trillion, one hundred one billion, two hundred twenty-one million, two hundred nineteen thousand, eight hundred sixty-one".