21442301 has 2 divisors, whose sum is σ = 21442302. Its totient is φ = 21442300.

The previous prime is 21442283. The next prime is 21442307. The reversal of 21442301 is 10324412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17422276 + 4020025 = 4174^2 + 2005^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21442301 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21442301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21442307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10721150 + 10721151.

It is an arithmetic number, because the mean of its divisors is an integer number (10721151).

Almost surely, 2^21442301 is an apocalyptic number.

It is an amenable number.

21442301 is a deficient number, since it is larger than the sum of its proper divisors (1).

21442301 is an equidigital number, since it uses as much as digits as its factorization.

21442301 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21442301 is about 4630.5832246057. The cubic root of 21442301 is about 277.8159202675.

Adding to 21442301 its reverse (10324412), we get a palindrome (31766713).

The spelling of 21442301 in words is "twenty-one million, four hundred forty-two thousand, three hundred one".