21441544520 has 64 divisors (see below), whose sum is σ = 53150437440. Its totient is φ = 7719712000.

The previous prime is 21441544519. The next prime is 21441544567. The reversal of 21441544520 is 2544514412.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196802 + ... + 285681.

It is an arithmetic number, because the mean of its divisors is an integer number (830475585).

Almost surely, 2^21441544520 is an apocalyptic number.

21441544520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21441544520 is an abundant number, since it is smaller than the sum of its proper divisors (31708892920).

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

21441544520 is a wasteful number, since it uses less digits than its factorization.

21441544520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482606 (or 482602 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 32.

The spelling of 21441544520 in words is "twenty-one billion, four hundred forty-one million, five hundred forty-four thousand, five hundred twenty".