21210021220230 has 40 divisors (see below), whose sum is σ = 57031390394352. Its totient is φ = 5656005658512.

The previous prime is 21210021220211. The next prime is 21210021220237. The reversal of 21210021220230 is 3202212001212.

21210021220230 is a `hidden beast` number, since 2 + 1 + 210 + 0 + 2 + 1 + 220 + 230 = 666.

It is a super-2 number, since 2×21210021220230² (a number of 27 digits) contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210021220237) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 13092604882 + ... + 13092606501.

Almost surely, 2^{21210021220230} is an apocalyptic number.

21210021220230 is an abundant number, since it is smaller than the sum of its proper divisors (35821369174122).

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

21210021220230 is a wasteful number, since it uses less digits than its factorization.

21210021220230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26185211402 (or 26185211393 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21210021220230 its reverse (3202212001212), we get a palindrome (24412233221442).

The spelling of 21210021220230 in words is "twenty-one trillion, two hundred ten billion, twenty-one million, two hundred twenty thousand, two hundred thirty".