21267146928 has 40 divisors (see below), whose sum is σ = 54984985200. Its totient is φ = 7083261184.

The previous prime is 21267146917. The next prime is 21267146987. The reversal of 21267146928 is 82964176212.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121263 + ... + 239246.

It is an arithmetic number, because the mean of its divisors is an integer number (1374624630).

Almost surely, 2^21267146928 is an apocalyptic number.

It is an amenable number.

21267146928 is an abundant number, since it is smaller than the sum of its proper divisors (33717838272).

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

21267146928 is a wasteful number, since it uses less digits than its factorization.

21267146928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361749 (or 361743 counting only the distinct ones).

The product of its digits is 580608, while the sum is 48.

The spelling of 21267146928 in words is "twenty-one billion, two hundred sixty-seven million, one hundred forty-six thousand, nine hundred twenty-eight".