21023434334320 has 80 divisors (see below), whose sum is σ = 53336351076480. Its totient is φ = 7642981740800.

The previous prime is 21023434334311. The next prime is 21023434334369. The reversal of 21023434334320 is 2343343432012.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 564555 + ... + 6508885.

It is an arithmetic number, because the mean of its divisors is an integer number (666704388456).

Almost surely, 2^{21023434334320} is an apocalyptic number.

21023434334320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21023434334320 is an abundant number, since it is smaller than the sum of its proper divisors (32312916742160).

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

21023434334320 is a wasteful number, since it uses less digits than its factorization.

21023434334320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5948374 (or 5948368 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 34.

Adding to 21023434334320 its reverse (2343343432012), we get a palindrome (23366777766332).

The spelling of 21023434334320 in words is "twenty-one trillion, twenty-three billion, four hundred thirty-four million, three hundred thirty-four thousand, three hundred twenty".