21220211434 has 16 divisors (see below), whose sum is σ = 32226784128. Its totient is φ = 10478053152.

The previous prime is 21220211429. The next prime is 21220211479. The reversal of 21220211434 is 43411202212.

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 7 ways as a sum of consecutive naturals, for example, 409999 + ... + 458845.

It is an arithmetic number, because the mean of its divisors is an integer number (2014174008).

Almost surely, 2^21220211434 is an apocalyptic number.

21220211434 is a deficient number, since it is larger than the sum of its proper divisors (11006572694).

21220211434 is a wasteful number, since it uses less digits than its factorization.

21220211434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51549.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21220211434 its reverse (43411202212), we get a palindrome (64631413646).

The spelling of 21220211434 in words is "twenty-one billion, two hundred twenty million, two hundred eleven thousand, four hundred thirty-four".