101220222100021 has 2 divisors, whose sum is σ = 101220222100022. Its totient is φ = 101220222100020.

The previous prime is 101220222099991. The next prime is 101220222100031. The reversal of 101220222100021 is 120001222022101.

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., 85983799835025 + 15236422264996 = 9272745^2 + 3903386^2 .

It is a cyclic number.

It is not a de Polignac number, because 101220222100021 - 2¹³ = 101220222091829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 101220222099968 and 101220222100004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101220222100031) 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 as a sum of consecutive naturals, namely, 50610111050010 + 50610111050011.

It is an arithmetic number, because the mean of its divisors is an integer number (50610111050011).

Almost surely, 2^{101220222100021} is an apocalyptic number.

It is an amenable number.

101220222100021 is a deficient number, since it is larger than the sum of its proper divisors (1).

101220222100021 is an equidigital number, since it uses as much as digits as its factorization.

101220222100021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 101220222100021 its reverse (120001222022101), we get a palindrome (221221444122122).

The spelling of 101220222100021 in words is "one hundred one trillion, two hundred twenty billion, two hundred twenty-two million, one hundred thousand, twenty-one".