21124343310 has 128 divisors (see below), whose sum is σ = 62355723264. Its totient is φ = 4469852160.

The previous prime is 21124343297. The next prime is 21124343323. The reversal of 21124343310 is 1334342112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21124343297) and next prime (21124343323).

It is a super-2 number, since 2×21124343310² (a number of 21 digits) contains 22 as substring.

It is a Curzon 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 63 ways as a sum of consecutive naturals, for example, 169269 + ... + 266271.

It is an arithmetic number, because the mean of its divisors is an integer number (487154088).

Almost surely, 2^21124343310 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21124343310, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31177861632).

21124343310 is an abundant number, since it is smaller than the sum of its proper divisors (41231379954).

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

21124343310 is a wasteful number, since it uses less digits than its factorization.

21124343310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97098.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21124343310 its reverse (1334342112), we get a palindrome (22458685422).

The spelling of 21124343310 in words is "twenty-one billion, one hundred twenty-four million, three hundred forty-three thousand, three hundred ten".