21123321122130 has 128 divisors (see below), whose sum is σ = 53511638860800. Its totient is φ = 5321688908544.

The previous prime is 21123321122021. The next prime is 21123321122131. The reversal of 21123321122130 is 3122112332112.

It is a self number, because there is not a number n which added to its sum of digits gives 21123321122130.

It is not an unprimeable number, because it can be changed into a prime (21123321122131) by changing a digit.

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, 372208417 + ... + 372265163.

It is an arithmetic number, because the mean of its divisors is an integer number (418059678600).

Almost surely, 2^{21123321122130} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21123321122130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26755819430400).

21123321122130 is an abundant number, since it is smaller than the sum of its proper divisors (32388317738670).

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

21123321122130 is a wasteful number, since it uses less digits than its factorization.

21123321122130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58568.

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

Adding to 21123321122130 its reverse (3122112332112), we get a palindrome (24245433454242).

The spelling of 21123321122130 in words is "twenty-one trillion, one hundred twenty-three billion, three hundred twenty-one million, one hundred twenty-two thousand, one hundred thirty".