21501550150144 has 40 divisors (see below), whose sum is σ = 44828979243840. Its totient is φ = 10283350066176.

The previous prime is 21501550150141. The next prime is 21501550150183. The reversal of 21501550150144 is 44105105510512.

It is not an unprimeable number, because it can be changed into a prime (21501550150141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 912927684 + ... + 912951235.

It is an arithmetic number, because the mean of its divisors is an integer number (1120724481096).

Almost surely, 2^{21501550150144} is an apocalyptic number.

It is an amenable number.

21501550150144 is an abundant number, since it is smaller than the sum of its proper divisors (23327429093696).

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

21501550150144 is an equidigital number, since it uses as much as digits as its factorization.

21501550150144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1825878960 (or 1825878944 counting only the distinct ones).

The product of its (nonzero) digits is 20000, while the sum is 34.

Adding to 21501550150144 its reverse (44105105510512), we get a palindrome (65606655660656).

The spelling of 21501550150144 in words is "twenty-one trillion, five hundred one billion, five hundred fifty million, one hundred fifty thousand, one hundred forty-four".