21420243222 has 32 divisors (see below), whose sum is σ = 48968427264. Its totient is φ = 6119085600.

The previous prime is 21420243193. The next prime is 21420243227. The reversal of 21420243222 is 22234202412.

It is a junction number, because it is equal to n+sod(n) for n = 21420243192 and 21420243201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21420243227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 247197 + ... + 322407.

It is an arithmetic number, because the mean of its divisors is an integer number (1530263352).

Almost surely, 2^21420243222 is an apocalyptic number.

21420243222 is an abundant number, since it is smaller than the sum of its proper divisors (27548184042).

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

21420243222 is a wasteful number, since it uses less digits than its factorization.

21420243222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82004.

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 21420243222 its reverse (22234202412), we get a palindrome (43654445634).

The spelling of 21420243222 in words is "twenty-one billion, four hundred twenty million, two hundred forty-three thousand, two hundred twenty-two".