21312030210 has 32 divisors (see below), whose sum is σ = 51416681472. Its totient is φ = 5653451520.

The previous prime is 21312030199. The next prime is 21312030221. The reversal of 21312030210 is 1203021312.

It is an interprime number because it is at equal distance from previous prime (21312030199) and next prime (21312030221).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21312030210.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1853959 + ... + 1865418.

It is an arithmetic number, because the mean of its divisors is an integer number (1606771296).

Almost surely, 2^21312030210 is an apocalyptic number.

21312030210 is an abundant number, since it is smaller than the sum of its proper divisors (30104651262).

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

21312030210 is a wasteful number, since it uses less digits than its factorization.

21312030210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3719578.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21312030210 its reverse (1203021312), we get a palindrome (22515051522).

The spelling of 21312030210 in words is "twenty-one billion, three hundred twelve million, thirty thousand, two hundred ten".