21310143220 has 24 divisors (see below), whose sum is σ = 44758540008. Its totient is φ = 8522678400.

The previous prime is 21310143203. The next prime is 21310143223. The reversal of 21310143220 is 2234101312.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 39087504 + 21271055716 = 6252^2 + 145846^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310143223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45450 + ... + 211390.

It is an arithmetic number, because the mean of its divisors is an integer number (1864939167).

Almost surely, 2^21310143220 is an apocalyptic number.

21310143220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21310143220 is an abundant number, since it is smaller than the sum of its proper divisors (23448396788).

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

21310143220 is a wasteful number, since it uses less digits than its factorization.

21310143220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172371 (or 172369 counting only the distinct ones).

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

Adding to 21310143220 its reverse (2234101312), we get a palindrome (23544244532).

The spelling of 21310143220 in words is "twenty-one billion, three hundred ten million, one hundred forty-three thousand, two hundred twenty".