21403533312 has 322 divisors, whose sum is σ = 73349979608. Its totient is φ = 6115295232.

The previous prime is 21403533289. The next prime is 21403533331. The reversal of 21403533312 is 21333530412.

It is a super-2 number, since 2×21403533312² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 3057647613 + ... + 3057647619.

Almost surely, 2^21403533312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21403533312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36674989804).

21403533312 is an abundant number, since it is smaller than the sum of its proper divisors (51946446296).

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

21403533312 is an frugal number, since it uses more digits than its factorization.

21403533312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69 (or 12 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 27.

The spelling of 21403533312 in words is "twenty-one billion, four hundred three million, five hundred thirty-three thousand, three hundred twelve".