21212023321230 has 64 divisors (see below), whose sum is σ = 58181949665280. Its totient is φ = 4848429141504.

The previous prime is 21212023321193. The next prime is 21212023321231. The reversal of 21212023321230 is 3212332021212.

It is a self number, because there is not a number n which added to its sum of digits gives 21212023321230.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212023321231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43312387 + ... + 43799393.

It is an arithmetic number, because the mean of its divisors is an integer number (909092963520).

Almost surely, 2^{21212023321230} is an apocalyptic number.

21212023321230 is an abundant number, since it is smaller than the sum of its proper divisors (36969926344050).

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

21212023321230 is a wasteful number, since it uses less digits than its factorization.

21212023321230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694433.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21212023321230 its reverse (3212332021212), we get a palindrome (24424355342442).

The spelling of 21212023321230 in words is "twenty-one trillion, two hundred twelve billion, twenty-three million, three hundred twenty-one thousand, two hundred thirty".