21210003030 has 64 divisors (see below), whose sum is σ = 51670415808. Its totient is φ = 5571417600.

The previous prime is 21210003011. The next prime is 21210003037. The reversal of 21210003030 is 3030001212.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21210002997 and 21210003015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210003037) 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 31 ways as a sum of consecutive naturals, for example, 579144 + ... + 614676.

It is an arithmetic number, because the mean of its divisors is an integer number (807350247).

Almost surely, 2^21210003030 is an apocalyptic number.

21210003030 is an abundant number, since it is smaller than the sum of its proper divisors (30460412778).

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

21210003030 is a wasteful number, since it uses less digits than its factorization.

21210003030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35841.

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 21210003030 its reverse (3030001212), we get a palindrome (24240004242).

The spelling of 21210003030 in words is "twenty-one billion, two hundred ten million, three thousand, thirty".