21225773 has 2 divisors, whose sum is σ = 21225774. Its totient is φ = 21225772.

The previous prime is 21225769. The next prime is 21225797. The reversal of 21225773 is 37752212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20675209 + 550564 = 4547^2 + 742^2 .

It is a cyclic number.

It is not a de Polignac number, because 21225773 - 2² = 21225769 is a prime.

It is equal to p_1343297 and since 21225773 and 1343297 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21225713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10612886 + 10612887.

It is an arithmetic number, because the mean of its divisors is an integer number (10612887).

Almost surely, 2^21225773 is an apocalyptic number.

It is an amenable number.

21225773 is a deficient number, since it is larger than the sum of its proper divisors (1).

21225773 is an equidigital number, since it uses as much as digits as its factorization.

21225773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5880, while the sum is 29.

The square root of 21225773 is about 4607.1436921372. The cubic root of 21225773 is about 276.8776106129.

Adding to 21225773 its reverse (37752212), we get a palindrome (58977985).

The spelling of 21225773 in words is "twenty-one million, two hundred twenty-five thousand, seven hundred seventy-three".