21480135468 has 24 divisors (see below), whose sum is σ = 54676708800. Its totient is φ = 6509131920.

The previous prime is 21480135461. The next prime is 21480135499. The reversal of 21480135468 is 86453108412.

It is a happy number.

It is a super-2 number, since 2×21480135468² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21480135461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81364018 + ... + 81364281.

It is an arithmetic number, because the mean of its divisors is an integer number (2278196200).

Almost surely, 2^21480135468 is an apocalyptic number.

It is an amenable number.

21480135468 is an abundant number, since it is smaller than the sum of its proper divisors (33196573332).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21480135468 is a wasteful number, since it uses less digits than its factorization.

21480135468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162728317 (or 162728315 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 42.

The spelling of 21480135468 in words is "twenty-one billion, four hundred eighty million, one hundred thirty-five thousand, four hundred sixty-eight".