21144031241 has 2 divisors, whose sum is σ = 21144031242. Its totient is φ = 21144031240.

The previous prime is 21144031219. The next prime is 21144031267. The reversal of 21144031241 is 14213044112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11984775625 + 9159255616 = 109475^2 + 95704^2 .

It is a cyclic number.

It is not a de Polignac number, because 21144031241 - 2⁶ = 21144031177 is a prime.

It is not a weakly prime, because it can be changed into another prime (21144031201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10572015620 + 10572015621.

It is an arithmetic number, because the mean of its divisors is an integer number (10572015621).

Almost surely, 2^21144031241 is an apocalyptic number.

It is an amenable number.

21144031241 is a deficient number, since it is larger than the sum of its proper divisors (1).

21144031241 is an equidigital number, since it uses as much as digits as its factorization.

21144031241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 21144031241 its reverse (14213044112), we get a palindrome (35357075353).

The spelling of 21144031241 in words is "twenty-one billion, one hundred forty-four million, thirty-one thousand, two hundred forty-one".