100120220021 has 2 divisors, whose sum is σ = 100120220022. Its totient is φ = 100120220020.

The previous prime is 100120219973. The next prime is 100120220023. The reversal of 100120220021 is 120022021001.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56745909796 + 43374310225 = 238214^2 + 208265^2 .

It is a cyclic number.

It is not a de Polignac number, because 100120220021 - 2⁶ = 100120219957 is a prime.

Together with 100120220023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 100120219984 and 100120220011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100120220023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50060110010 + 50060110011.

It is an arithmetic number, because the mean of its divisors is an integer number (50060110011).

Almost surely, 2^100120220021 is an apocalyptic number.

It is an amenable number.

100120220021 is a deficient number, since it is larger than the sum of its proper divisors (1).

100120220021 is an equidigital number, since it uses as much as digits as its factorization.

100120220021 is an evil number, because the sum of its binary digits is even.

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

Adding to 100120220021 its reverse (120022021001), we get a palindrome (220142241022).

The spelling of 100120220021 in words is "one hundred billion, one hundred twenty million, two hundred twenty thousand, twenty-one".