21434312220 has 48 divisors (see below), whose sum is σ = 60070671360. Its totient is φ = 5710616896.

The previous prime is 21434312203. The next prime is 21434312231. The reversal of 21434312220 is 2221343412.

It is a happy number.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 95760 + ... + 228119.

It is an arithmetic number, because the mean of its divisors is an integer number (1251472320).

Almost surely, 2^21434312220 is an apocalyptic number.

21434312220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21434312220 is an abundant number, since it is smaller than the sum of its proper divisors (38636359140).

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

21434312220 is a wasteful number, since it uses less digits than its factorization.

21434312220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324994 (or 324992 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21434312220 its reverse (2221343412), we get a palindrome (23655655632).

The spelling of 21434312220 in words is "twenty-one billion, four hundred thirty-four million, three hundred twelve thousand, two hundred twenty".