102120011221 has 4 divisors (see below), whose sum is σ = 104610743244. Its totient is φ = 99629279200.

The previous prime is 102120011099. The next prime is 102120011281. The reversal of 102120011221 is 122110021201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 54021380625 + 48098630596 = 232425^2 + 219314^2 .

It is a cyclic number.

It is not a de Polignac number, because 102120011221 - 2²¹ = 102117914069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102120011281) 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 3 ways as a sum of consecutive naturals, for example, 1245365950 + ... + 1245366031.

It is an arithmetic number, because the mean of its divisors is an integer number (26152685811).

Almost surely, 2^102120011221 is an apocalyptic number.

It is an amenable number.

102120011221 is a deficient number, since it is larger than the sum of its proper divisors (2490732023).

102120011221 is an equidigital number, since it uses as much as digits as its factorization.

102120011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2490732022.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 102120011221 its reverse (122110021201), we get a palindrome (224230032422).

The spelling of 102120011221 in words is "one hundred two billion, one hundred twenty million, eleven thousand, two hundred twenty-one".