21323010023420 has 96 divisors (see below), whose sum is σ = 54208399150080. Its totient is φ = 6877798548480.

The previous prime is 21323010023377. The next prime is 21323010023431. The reversal of 21323010023420 is 2432001032312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3753641 + ... + 7532319.

It is an arithmetic number, because the mean of its divisors is an integer number (564670824480).

Almost surely, 2^{21323010023420} is an apocalyptic number.

21323010023420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21323010023420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27104199575040).

21323010023420 is an abundant number, since it is smaller than the sum of its proper divisors (32885389126660).

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

21323010023420 is a wasteful number, since it uses less digits than its factorization.

21323010023420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3781083 (or 3781081 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21323010023420 its reverse (2432001032312), we get a palindrome (23755011055732).

The spelling of 21323010023420 in words is "twenty-one trillion, three hundred twenty-three billion, ten million, twenty-three thousand, four hundred twenty".