21460413547 has 2 divisors, whose sum is σ = 21460413548. Its totient is φ = 21460413546.

The previous prime is 21460413503. The next prime is 21460413587. The reversal of 21460413547 is 74531406412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21460413547 - 2²³ = 21452024939 is a prime.

It is a super-2 number, since 2×21460413547² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21460413587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10730206773 + 10730206774.

It is an arithmetic number, because the mean of its divisors is an integer number (10730206774).

Almost surely, 2^21460413547 is an apocalyptic number.

21460413547 is a deficient number, since it is larger than the sum of its proper divisors (1).

21460413547 is an equidigital number, since it uses as much as digits as its factorization.

21460413547 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 37.

Adding to 21460413547 its reverse (74531406412), we get a palindrome (95991819959).

The spelling of 21460413547 in words is "twenty-one billion, four hundred sixty million, four hundred thirteen thousand, five hundred forty-seven".