21221342123210 has 32 divisors (see below), whose sum is σ = 39062753978112. Its totient is φ = 8297643706560.

The previous prime is 21221342123173. The next prime is 21221342123227. The reversal of 21221342123210 is 1232124312212.

It is a super-3 number, since 3×21221342123210³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21221342123210.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73731404 + ... + 74018663.

It is an arithmetic number, because the mean of its divisors is an integer number (1220711061816).

Almost surely, 2^{21221342123210} is an apocalyptic number.

21221342123210 is a deficient number, since it is larger than the sum of its proper divisors (17841411854902).

21221342123210 is a wasteful number, since it uses less digits than its factorization.

21221342123210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147750398.

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 21221342123210 its reverse (1232124312212), we get a palindrome (22453466435422).

The spelling of 21221342123210 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred forty-two million, one hundred twenty-three thousand, two hundred ten".