11021861 has 2 divisors, whose sum is σ = 11021862. Its totient is φ = 11021860.

The previous prime is 11021839. The next prime is 11021863. The reversal of 11021861 is 16812011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10857025 + 164836 = 3295^2 + 406^2 .

It is a cyclic number.

It is not a de Polignac number, because 11021861 - 2¹⁰ = 11020837 is a prime.

Together with 11021863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11021863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5510930 + 5510931.

It is an arithmetic number, because the mean of its divisors is an integer number (5510931).

Almost surely, 2^11021861 is an apocalyptic number.

It is an amenable number.

11021861 is a deficient number, since it is larger than the sum of its proper divisors (1).

11021861 is an equidigital number, since it uses as much as digits as its factorization.

11021861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 20.

The square root of 11021861 is about 3319.9188243088. The cubic root of 11021861 is about 222.5452401381.

Adding to 11021861 its reverse (16812011), we get a palindrome (27833872).

The spelling of 11021861 in words is "eleven million, twenty-one thousand, eight hundred sixty-one".