12021101 has 4 divisors (see below), whose sum is σ = 12028992. Its totient is φ = 12013212.

The previous prime is 12021071. The next prime is 12021131. The reversal of 12021101 is 10112021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 10112021 = 131 ⋅77191.

It is an interprime number because it is at equal distance from previous prime (12021071) and next prime (12021131).

It is a cyclic number.

It is not a de Polignac number, because 12021101 - 2¹⁴ = 12004717 is a prime.

It is a Duffinian number.

It is a zygodrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 851 + ... + 4976.

It is an arithmetic number, because the mean of its divisors is an integer number (3007248).

Almost surely, 2^12021101 is an apocalyptic number.

It is an amenable number.

12021101 is a deficient number, since it is larger than the sum of its proper divisors (7891).

12021101 is an equidigital number, since it uses as much as digits as its factorization.

12021101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7890.

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

The square root of 12021101 is about 3467.1459444333. The cubic root of 12021101 is about 229.0769622389.

Adding to 12021101 its reverse (10112021), we get a palindrome (22133122).

It can be divided in two parts, 12021 and 101, that multiplied together give a palindrome (1214121).

The spelling of 12021101 in words is "twelve million, twenty-one thousand, one hundred one".