21441137 has 2 divisors, whose sum is σ = 21441138. Its totient is φ = 21441136.

The previous prime is 21441113. The next prime is 21441169. The reversal of 21441137 is 73114412.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20511841 + 929296 = 4529^2 + 964^2 .

It is a cyclic number.

It is not a de Polignac number, because 21441137 - 2¹² = 21437041 is a prime.

It is not a weakly prime, because it can be changed into another prime (21441197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10720568 + 10720569.

It is an arithmetic number, because the mean of its divisors is an integer number (10720569).

Almost surely, 2^21441137 is an apocalyptic number.

It is an amenable number.

21441137 is a deficient number, since it is larger than the sum of its proper divisors (1).

21441137 is an equidigital number, since it uses as much as digits as its factorization.

21441137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 672, while the sum is 23.

The square root of 21441137 is about 4630.4575367883. The cubic root of 21441137 is about 277.8108930772.

Adding to 21441137 its reverse (73114412), we get a palindrome (94555549).

The spelling of 21441137 in words is "twenty-one million, four hundred forty-one thousand, one hundred thirty-seven".