21200330040 has 256 divisors, whose sum is σ = 67848883200. Its totient is φ = 5288177664.

The previous prime is 21200330023. The next prime is 21200330051. The reversal of 21200330040 is 4003300212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 28005342 + ... + 28006098.

It is an arithmetic number, because the mean of its divisors is an integer number (265034700).

Almost surely, 2^21200330040 is an apocalyptic number.

21200330040 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 21200330040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33924441600).

21200330040 is an abundant number, since it is smaller than the sum of its proper divisors (46648553160).

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

21200330040 is a wasteful number, since it uses less digits than its factorization.

21200330040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006 (or 1002 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

Adding to 21200330040 its reverse (4003300212), we get a palindrome (25203630252).

The spelling of 21200330040 in words is "twenty-one billion, two hundred million, three hundred thirty thousand, forty".