21026995200 has 528 divisors, whose sum is σ = 79955820000. Its totient is φ = 5408686080.

The previous prime is 21026995169. The next prime is 21026995201. The reversal of 21026995200 is 259962012.

It is a happy number.

21026995200 is a `hidden beast` number, since 21 + 0 + 26 + 99 + 520 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21026995201) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20044276 + ... + 20045324.

Almost surely, 2^21026995200 is an apocalyptic number.

21026995200 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 21026995200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39977910000).

21026995200 is an abundant number, since it is smaller than the sum of its proper divisors (58928824800).

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

21026995200 is a wasteful number, since it uses less digits than its factorization.

21026995200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117 (or 1088 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The spelling of 21026995200 in words is "twenty-one billion, twenty-six million, nine hundred ninety-five thousand, two hundred".