21467981468 has 24 divisors (see below), whose sum is σ = 37786581504. Its totient is φ = 10671922800.

The previous prime is 21467981453. The next prime is 21467981473. The reversal of 21467981468 is 86418976412.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 823571 + ... + 849237.

It is an arithmetic number, because the mean of its divisors is an integer number (1574440896).

Almost surely, 2^21467981468 is an apocalyptic number.

It is an amenable number.

21467981468 is a deficient number, since it is larger than the sum of its proper divisors (16318600036).

21467981468 is a wasteful number, since it uses less digits than its factorization.

21467981468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26873 (or 26871 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 56.

The spelling of 21467981468 in words is "twenty-one billion, four hundred sixty-seven million, nine hundred eighty-one thousand, four hundred sixty-eight".