21231023310 has 144 divisors (see below), whose sum is σ = 67005203616. Its totient is φ = 4641791616.

The previous prime is 21231023293. The next prime is 21231023321. The reversal of 21231023310 is 1332013212.

21231023310 is a `hidden beast` number, since 21 + 2 + 310 + 2 + 331 + 0 = 666.

It is a super-2 number, since 2×21231023310² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3229 + ... + 206088.

It is an arithmetic number, because the mean of its divisors is an integer number (465313914).

Almost surely, 2^21231023310 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21231023310, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33502601808).

21231023310 is an abundant number, since it is smaller than the sum of its proper divisors (45774180306).

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

21231023310 is a wasteful number, since it uses less digits than its factorization.

21231023310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209367 (or 209357 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21231023310 its reverse (1332013212), we get a palindrome (22563036522).

The spelling of 21231023310 in words is "twenty-one billion, two hundred thirty-one million, twenty-three thousand, three hundred ten".