21012111302320 has 40 divisors (see below), whose sum is σ = 49123065766320. Its totient is φ = 8358408910080.

The previous prime is 21012111302311. The next prime is 21012111302323. The reversal of 21012111302320 is 2320311121012.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (21012111302323) 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, 725541850 + ... + 725570809.

It is an arithmetic number, because the mean of its divisors is an integer number (1228076644158).

Almost surely, 2^{21012111302320} is an apocalyptic number.

21012111302320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012111302320 is an abundant number, since it is smaller than the sum of its proper divisors (28110954464000).

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

21012111302320 is a wasteful number, since it uses less digits than its factorization.

21012111302320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1451112853 (or 1451112847 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21012111302320 its reverse (2320311121012), we get a palindrome (23332422423332).

The spelling of 21012111302320 in words is "twenty-one trillion, twelve billion, one hundred eleven million, three hundred two thousand, three hundred twenty".