21030301220 has 12 divisors (see below), whose sum is σ = 44163632604. Its totient is φ = 8412120480.

The previous prime is 21030301177. The next prime is 21030301241. The reversal of 21030301220 is 2210303012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10814752036 + 10215549184 = 103994^2 + 101072^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21030301195 and 21030301204.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 525757511 + ... + 525757550.

It is an arithmetic number, because the mean of its divisors is an integer number (3680302717).

Almost surely, 2^21030301220 is an apocalyptic number.

21030301220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21030301220 is an abundant number, since it is smaller than the sum of its proper divisors (23133331384).

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

21030301220 is a wasteful number, since it uses less digits than its factorization.

21030301220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051515070 (or 1051515068 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21030301220 its reverse (2210303012), we get a palindrome (23240604232).

The spelling of 21030301220 in words is "twenty-one billion, thirty million, three hundred one thousand, two hundred twenty".