21267928312 has 32 divisors (see below), whose sum is σ = 42952377600. Its totient is φ = 9839993184.

The previous prime is 21267928309. The next prime is 21267928373. The reversal of 21267928312 is 21382976212.

It is a Harshad number since it is a multiple of its sum of digits (43).

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, 1620448 + ... + 1633519.

It is an arithmetic number, because the mean of its divisors is an integer number (1342261800).

Almost surely, 2^21267928312 is an apocalyptic number.

It is an amenable number.

21267928312 is an abundant number, since it is smaller than the sum of its proper divisors (21684449288).

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

21267928312 is a wasteful number, since it uses less digits than its factorization.

21267928312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3254035 (or 3254031 counting only the distinct ones).

The product of its digits is 145152, while the sum is 43.

The spelling of 21267928312 in words is "twenty-one billion, two hundred sixty-seven million, nine hundred twenty-eight thousand, three hundred twelve".