21043401288 has 64 divisors (see below), whose sum is σ = 64748933760. Its totient is φ = 5549907456.

The previous prime is 21043401277. The next prime is 21043401289. The reversal of 21043401288 is 88210434012.

It is not an unprimeable number, because it can be changed into a prime (21043401289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4815445 + ... + 4819812.

It is an arithmetic number, because the mean of its divisors is an integer number (1011702090).

Almost surely, 2^21043401288 is an apocalyptic number.

21043401288 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21043401288 is an abundant number, since it is smaller than the sum of its proper divisors (43705532472).

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

21043401288 is a wasteful number, since it uses less digits than its factorization.

21043401288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9635286 (or 9635282 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The spelling of 21043401288 in words is "twenty-one billion, forty-three million, four hundred one thousand, two hundred eighty-eight".