21030354524520 has 96 divisors (see below), whose sum is σ = 74562166055520. Its totient is φ = 5098267762560.

The previous prime is 21030354524503. The next prime is 21030354524527. The reversal of 21030354524520 is 2542545303012.

21030354524520 is a `hidden beast` number, since 2 + 1 + 0 + 30 + 3 + 54 + 52 + 4 + 520 = 666.

It is a super-2 number, since 2×21030354524520² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21030354524527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2655343834 + ... + 2655351753.

It is an arithmetic number, because the mean of its divisors is an integer number (776689229745).

Almost surely, 2^{21030354524520} is an apocalyptic number.

21030354524520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21030354524520 is an abundant number, since it is smaller than the sum of its proper divisors (53531811531000).

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

21030354524520 is a wasteful number, since it uses less digits than its factorization.

21030354524520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5310695615 (or 5310695608 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 36.

Adding to 21030354524520 its reverse (2542545303012), we get a palindrome (23572899827532).

The spelling of 21030354524520 in words is "twenty-one trillion, thirty billion, three hundred fifty-four million, five hundred twenty-four thousand, five hundred twenty".