101220999999 has 16 divisors (see below), whose sum is σ = 156193950720. Its totient is φ = 57108411360.

The previous prime is 101220999983. The next prime is 101221000009. The reversal of 101220999999 is 999999022101.

It is a happy number.

It is not a de Polignac number, because 101220999999 - 2⁴ = 101220999983 is a prime.

101220999999 is a modest number, since divided by 999999 gives 101220 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101220999799) 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, 30504972 + ... + 30508289.

It is an arithmetic number, because the mean of its divisors is an integer number (9762121920).

Almost surely, 2^101220999999 is an apocalyptic number.

101220999999 is a deficient number, since it is larger than the sum of its proper divisors (54972950721).

101220999999 is an equidigital number, since it uses as much as digits as its factorization.

101220999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61013350.

The product of its (nonzero) digits is 2125764, while the sum is 60.

The spelling of 101220999999 in words is "one hundred one billion, two hundred twenty million, nine hundred ninety-nine thousand, nine hundred ninety-nine".