21530335023120 has 160 divisors (see below), whose sum is σ = 83213346862080. Its totient is φ = 4473835845120.

The previous prime is 21530335023097. The next prime is 21530335023209. The reversal of 21530335023120 is 2132053303512.

It is a happy number.

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 31 ways as a sum of consecutive naturals, for example, 582512230 + ... + 582549189.

It is an arithmetic number, because the mean of its divisors is an integer number (520083417888).

Almost surely, 2^{21530335023120} is an apocalyptic number.

21530335023120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21530335023120 is an abundant number, since it is smaller than the sum of its proper divisors (61683011838960).

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

21530335023120 is a wasteful number, since it uses less digits than its factorization.

21530335023120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1165061453 (or 1165061447 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 30.

Adding to 21530335023120 its reverse (2132053303512), we get a palindrome (23662388326632).

The spelling of 21530335023120 in words is "twenty-one trillion, five hundred thirty billion, three hundred thirty-five million, twenty-three thousand, one hundred twenty".