21422743241 has 2 divisors, whose sum is σ = 21422743242. Its totient is φ = 21422743240.

The previous prime is 21422743229. The next prime is 21422743337. The reversal of 21422743241 is 14234722412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21205475641 + 217267600 = 145621^2 + 14740^2 .

It is a cyclic number.

It is not a de Polignac number, because 21422743241 - 2³⁴ = 4242874057 is a prime.

It is a super-2 number, since 2×21422743241² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21422743198 and 21422743207.

It is not a weakly prime, because it can be changed into another prime (21422743141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10711371620 + 10711371621.

It is an arithmetic number, because the mean of its divisors is an integer number (10711371621).

Almost surely, 2^21422743241 is an apocalyptic number.

It is an amenable number.

21422743241 is a deficient number, since it is larger than the sum of its proper divisors (1).

21422743241 is an equidigital number, since it uses as much as digits as its factorization.

21422743241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21504, while the sum is 32.

The spelling of 21422743241 in words is "twenty-one billion, four hundred twenty-two million, seven hundred forty-three thousand, two hundred forty-one".