21455433000 has 192 divisors, whose sum is σ = 73052899920. Its totient is φ = 5679360000.

The previous prime is 21455432989. The next prime is 21455433011. The reversal of 21455433000 is 33455412.

It is an interprime number because it is at equal distance from previous prime (21455432989) and next prime (21455433011).

It can be written as a sum of positive squares in 8 ways, for example, as 1508390244 + 19947042756 = 38838^2 + 141234^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1224300 + ... + 1241700.

Almost surely, 2^21455433000 is an apocalyptic number.

21455433000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21455433000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36526449960).

21455433000 is an abundant number, since it is smaller than the sum of its proper divisors (51597466920).

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

21455433000 is a wasteful number, since it uses less digits than its factorization.

21455433000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17565 (or 17548 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

Adding to 21455433000 its reverse (33455412), we get a palindrome (21488888412).

The spelling of 21455433000 in words is "twenty-one billion, four hundred fifty-five million, four hundred thirty-three thousand".