21440562041 has 2 divisors, whose sum is σ = 21440562042. Its totient is φ = 21440562040.

The previous prime is 21440562029. The next prime is 21440562043. The reversal of 21440562041 is 14026504412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16543361641 + 4897200400 = 128621^2 + 69980^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21440562041 is a prime.

Together with 21440562043, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21440561995 and 21440562013.

It is not a weakly prime, because it can be changed into another prime (21440562043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10720281020 + 10720281021.

It is an arithmetic number, because the mean of its divisors is an integer number (10720281021).

Almost surely, 2^21440562041 is an apocalyptic number.

It is an amenable number.

21440562041 is a deficient number, since it is larger than the sum of its proper divisors (1).

21440562041 is an equidigital number, since it uses as much as digits as its factorization.

21440562041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7680, while the sum is 29.

The spelling of 21440562041 in words is "twenty-one billion, four hundred forty million, five hundred sixty-two thousand, forty-one".