100120022021 has 4 divisors (see below), whose sum is σ = 100125128844. Its totient is φ = 100114915200.

The previous prime is 100120022011. The next prime is 100120022039. The reversal of 100120022021 is 120220021001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120220021001 = 5107 ⋅23540243.

It can be written as a sum of positive squares in 2 ways, for example, as 99405261796 + 714760225 = 315286^2 + 26735^2 .

It is a cyclic number.

It is not a de Polignac number, because 100120022021 - 2¹⁰ = 100120020997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100120021993 and 100120022011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100120022011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2523890 + ... + 2563251.

It is an arithmetic number, because the mean of its divisors is an integer number (25031282211).

Almost surely, 2^100120022021 is an apocalyptic number.

It is an amenable number.

100120022021 is a deficient number, since it is larger than the sum of its proper divisors (5106823).

100120022021 is an equidigital number, since it uses as much as digits as its factorization.

100120022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5106822.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 100120022021 its reverse (120220021001), we get a palindrome (220340043022).

The spelling of 100120022021 in words is "one hundred billion, one hundred twenty million, twenty-two thousand, twenty-one".