120021101 has 2 divisors, whose sum is σ = 120021102. Its totient is φ = 120021100.

The previous prime is 120021091. The next prime is 120021137. The reversal of 120021101 is 101120021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93508900 + 26512201 = 9670^2 + 5149^2 .

It is an emirp because it is prime and its reverse (101120021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 120021101 - 2¹⁰ = 120020077 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120021191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60010550 + 60010551.

It is an arithmetic number, because the mean of its divisors is an integer number (60010551).

Almost surely, 2^120021101 is an apocalyptic number.

It is an amenable number.

120021101 is a deficient number, since it is larger than the sum of its proper divisors (1).

120021101 is an equidigital number, since it uses as much as digits as its factorization.

120021101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 120021101 is about 10955.4142322415. The cubic root of 120021101 is about 493.2713240278.

Adding to 120021101 its reverse (101120021), we get a palindrome (221141122).

It can be divided in two parts, 120021 and 101, that multiplied together give a palindrome (12122121).

The spelling of 120021101 in words is "one hundred twenty million, twenty-one thousand, one hundred one".