21530052224400 has 120 divisors (see below), whose sum is σ = 69318025755264. Its totient is φ = 5712203302400.

The previous prime is 21530052224383. The next prime is 21530052224413. The reversal of 21530052224400 is 442225003512.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45300936 + ... + 45773735.

Almost surely, 2^{21530052224400} is an apocalyptic number.

21530052224400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21530052224400 is an abundant number, since it is smaller than the sum of its proper divisors (47787973530864).

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

21530052224400 is a wasteful number, since it uses less digits than its factorization.

21530052224400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91074889 (or 91074878 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 21530052224400 its reverse (442225003512), we get a palindrome (21972277227912).

The spelling of 21530052224400 in words is "twenty-one trillion, five hundred thirty billion, fifty-two million, two hundred twenty-four thousand, four hundred".