21230212221242 has 8 divisors (see below), whose sum is σ = 32367372730932. Its totient is φ = 10441087977600.

The previous prime is 21230212221223. The next prime is 21230212221293. The reversal of 21230212221242 is 24212221203212.

It can be written as a sum of positive squares in 2 ways, for example, as 20953863296521 + 276348924721 = 4577539^2 + 525689^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 87009066359 + ... + 87009066602.

Almost surely, 2^{21230212221242} is an apocalyptic number.

21230212221242 is a deficient number, since it is larger than the sum of its proper divisors (11137160509690).

21230212221242 is a wasteful number, since it uses less digits than its factorization.

21230212221242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174018133024.

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 21230212221242 its reverse (24212221203212), we get a palindrome (45442433424454).

The spelling of 21230212221242 in words is "twenty-one trillion, two hundred thirty billion, two hundred twelve million, two hundred twenty-one thousand, two hundred forty-two".