21420223422 has 32 divisors (see below), whose sum is σ = 46162962720. Its totient is φ = 6586967040.

The previous prime is 21420223421. The next prime is 21420223459. The reversal of 21420223422 is 22432202412.

It is a junction number, because it is equal to n+sod(n) for n = 21420223392 and 21420223401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21420223421) 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, 54454 + ... + 214022.

It is an arithmetic number, because the mean of its divisors is an integer number (1442592585).

Almost surely, 2^21420223422 is an apocalyptic number.

21420223422 is an abundant number, since it is smaller than the sum of its proper divisors (24742739298).

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

21420223422 is a wasteful number, since it uses less digits than its factorization.

21420223422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161308.

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

Adding to 21420223422 its reverse (22432202412), we get a palindrome (43852425834).

The spelling of 21420223422 in words is "twenty-one billion, four hundred twenty million, two hundred twenty-three thousand, four hundred twenty-two".