21210143320 has 16 divisors (see below), whose sum is σ = 47722822560. Its totient is φ = 8484057312.

The previous prime is 21210143293. The next prime is 21210143341. The reversal of 21210143320 is 2334101212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265126752 + ... + 265126831.

It is an arithmetic number, because the mean of its divisors is an integer number (2982676410).

Almost surely, 2^21210143320 is an apocalyptic number.

21210143320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210143320 is an abundant number, since it is smaller than the sum of its proper divisors (26512679240).

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

21210143320 is a wasteful number, since it uses less digits than its factorization.

21210143320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530253594 (or 530253590 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21210143320 its reverse (2334101212), we get a palindrome (23544244532).

The spelling of 21210143320 in words is "twenty-one billion, two hundred ten million, one hundred forty-three thousand, three hundred twenty".