21123122231310 has 192 divisors, whose sum is σ = 56411289043200. Its totient is φ = 5057555852800.

The previous prime is 21123122231209. The next prime is 21123122231333. The reversal of 21123122231310 is 1313222132112.

It is a super-2 number, since 2×21123122231310² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1268723866 + ... + 1268740514.

It is an arithmetic number, because the mean of its divisors is an integer number (293808797100).

Almost surely, 2^{21123122231310} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21123122231310, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28205644521600).

21123122231310 is an abundant number, since it is smaller than the sum of its proper divisors (35288166811890).

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

21123122231310 is a wasteful number, since it uses less digits than its factorization.

21123122231310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20975 (or 20964 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 21123122231310 its reverse (1313222132112), we get a palindrome (22436344363422).

The spelling of 21123122231310 in words is "twenty-one trillion, one hundred twenty-three billion, one hundred twenty-two million, two hundred thirty-one thousand, three hundred ten".