21254230140 has 192 divisors, whose sum is σ = 70152445440. Its totient is φ = 4740111360.

The previous prime is 21254230117. The next prime is 21254230157. The reversal of 21254230140 is 4103245212.

It is a self number, because there is not a number n which added to its sum of digits gives 21254230140.

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 63 ways as a sum of consecutive naturals, for example, 2630026 + ... + 2638094.

It is an arithmetic number, because the mean of its divisors is an integer number (365377320).

Almost surely, 2^21254230140 is an apocalyptic number.

21254230140 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 21254230140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35076222720).

21254230140 is an abundant number, since it is smaller than the sum of its proper divisors (48898215300).

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

21254230140 is a wasteful number, since it uses less digits than its factorization.

21254230140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8412 (or 8410 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 21254230140 its reverse (4103245212), we get a palindrome (25357475352).

The spelling of 21254230140 in words is "twenty-one billion, two hundred fifty-four million, two hundred thirty thousand, one hundred forty".