21480557867 has 2 divisors, whose sum is σ = 21480557868. Its totient is φ = 21480557866.

The previous prime is 21480557797. The next prime is 21480557869. The reversal of 21480557867 is 76875508412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21480557867 - 2¹⁰ = 21480556843 is a prime.

It is a super-2 number, since 2×21480557867² (a number of 21 digits) contains 22 as substring.

Together with 21480557869, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21480557869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10740278933 + 10740278934.

It is an arithmetic number, because the mean of its divisors is an integer number (10740278934).

Almost surely, 2^21480557867 is an apocalyptic number.

21480557867 is a deficient number, since it is larger than the sum of its proper divisors (1).

21480557867 is an equidigital number, since it uses as much as digits as its factorization.

21480557867 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3763200, while the sum is 53.

The spelling of 21480557867 in words is "twenty-one billion, four hundred eighty million, five hundred fifty-seven thousand, eight hundred sixty-seven".