21430030520 has 32 divisors (see below), whose sum is σ = 48694979520. Its totient is φ = 8487139200.

The previous prime is 21430030483. The next prime is 21430030541. The reversal of 21430030520 is 2503003412.

It is a happy number.

It is a super-3 number, since 3×21430030520³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21430030492 and 21430030501.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2648192 + ... + 2656271.

It is an arithmetic number, because the mean of its divisors is an integer number (1521718110).

Almost surely, 2^21430030520 is an apocalyptic number.

21430030520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21430030520 is an abundant number, since it is smaller than the sum of its proper divisors (27264949000).

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

21430030520 is a wasteful number, since it uses less digits than its factorization.

21430030520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5304575 (or 5304571 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

Adding to 21430030520 its reverse (2503003412), we get a palindrome (23933033932).

The spelling of 21430030520 in words is "twenty-one billion, four hundred thirty million, thirty thousand, five hundred twenty".