21433201020 has 240 divisors, whose sum is σ = 83828118528. Its totient is φ = 4453626240.

The previous prime is 21433200953. The next prime is 21433201081. The reversal of 21433201020 is 2010233412.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21433200984 and 21433201002.

It is a congruent number.

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 79 ways as a sum of consecutive naturals, for example, 38829 + ... + 210651.

Almost surely, 2^21433201020 is an apocalyptic number.

21433201020 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 21433201020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41914059264).

21433201020 is an abundant number, since it is smaller than the sum of its proper divisors (62394917508).

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

21433201020 is a wasteful number, since it uses less digits than its factorization.

21433201020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171862 (or 171851 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21433201020 its reverse (2010233412), we get a palindrome (23443434432).

The spelling of 21433201020 in words is "twenty-one billion, four hundred thirty-three million, two hundred one thousand, twenty".