21222030156542 has 8 divisors (see below), whose sum is σ = 31833268647600. Its totient is φ = 10610940607344.

The previous prime is 21222030156511. The next prime is 21222030156611. The reversal of 21222030156542 is 24565103022212.

It is a happy number.

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

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 36878567 + ... + 37449602.

It is an arithmetic number, because the mean of its divisors is an integer number (3979158580950).

Almost surely, 2^{21222030156542} is an apocalyptic number.

21222030156542 is a deficient number, since it is larger than the sum of its proper divisors (10611238491058).

21222030156542 is a wasteful number, since it uses less digits than its factorization.

21222030156542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74470930.

The product of its (nonzero) digits is 57600, while the sum is 35.

Adding to 21222030156542 its reverse (24565103022212), we get a palindrome (45787133178754).

The spelling of 21222030156542 in words is "twenty-one trillion, two hundred twenty-two billion, thirty million, one hundred fifty-six thousand, five hundred forty-two".