12021761 has 2 divisors, whose sum is σ = 12021762. Its totient is φ = 12021760.

The previous prime is 12021749. The next prime is 12021797. The reversal of 12021761 is 16712021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11771761 + 250000 = 3431^2 + 500^2 .

It is an emirp because it is prime and its reverse (16712021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12021761 - 2¹⁸ = 11759617 is a prime.

It is a super-2 number, since 2×12021761² = 289045475082242, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12021701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6010880 + 6010881.

It is an arithmetic number, because the mean of its divisors is an integer number (6010881).

It is a Proth number, since it is equal to 2935 ⋅ 2¹² + 1 and 2935 < 2¹².

Almost surely, 2^12021761 is an apocalyptic number.

It is an amenable number.

12021761 is a deficient number, since it is larger than the sum of its proper divisors (1).

12021761 is an equidigital number, since it uses as much as digits as its factorization.

12021761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 12021761 is about 3467.2411222757. The cubic root of 12021761 is about 229.0811545346.

Adding to 12021761 its reverse (16712021), we get a palindrome (28733782).

The spelling of 12021761 in words is "twelve million, twenty-one thousand, seven hundred sixty-one".