21500040333144 has 32 divisors (see below), whose sum is σ = 53773061289840. Its totient is φ = 7163618716800.

The previous prime is 21500040333143. The next prime is 21500040333169. The reversal of 21500040333144 is 44133304000512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21500040333143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191279787 + ... + 191392154.

Almost surely, 2^{21500040333144} is an apocalyptic number.

21500040333144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21500040333144 is an abundant number, since it is smaller than the sum of its proper divisors (32273020956696).

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

21500040333144 is a wasteful number, since it uses less digits than its factorization.

21500040333144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382674291 (or 382674287 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

Adding to 21500040333144 its reverse (44133304000512), we get a palindrome (65633344333656).

The spelling of 21500040333144 in words is "twenty-one trillion, five hundred billion, forty million, three hundred thirty-three thousand, one hundred forty-four".