21030413220 has 72 divisors (see below), whose sum is σ = 64183706496. Its totient is φ = 5573696832.

The previous prime is 21030413203. The next prime is 21030413231. The reversal of 21030413220 is 2231403012.

21030413220 is a `hidden beast` number, since 2 + 1 + 0 + 30 + 413 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21030413193 and 21030413202.

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, 329052 + ... + 387731.

It is an arithmetic number, because the mean of its divisors is an integer number (891440368).

Almost surely, 2^21030413220 is an apocalyptic number.

21030413220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21030413220 is an abundant number, since it is smaller than the sum of its proper divisors (43153293276).

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

21030413220 is a wasteful number, since it uses less digits than its factorization.

21030413220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716961 (or 716956 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21030413220 its reverse (2231403012), we get a palindrome (23261816232).

The spelling of 21030413220 in words is "twenty-one billion, thirty million, four hundred thirteen thousand, two hundred twenty".