23021643345540 has 192 divisors, whose sum is σ = 74199208204800. Its totient is φ = 5224270233600.

The previous prime is 23021643345523. The next prime is 23021643345581. The reversal of 23021643345540 is 4554334612032.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 23021643345492 and 23021643345501.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 132144490 + ... + 132318590.

It is an arithmetic number, because the mean of its divisors is an integer number (386454209400).

Almost surely, 2^{23021643345540} is an apocalyptic number.

23021643345540 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 23021643345540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37099604102400).

23021643345540 is an abundant number, since it is smaller than the sum of its proper divisors (51177564859260).

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

23021643345540 is a wasteful number, since it uses less digits than its factorization.

23021643345540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176382 (or 176380 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 42.

Adding to 23021643345540 its reverse (4554334612032), we get a palindrome (27575977957572).

The spelling of 23021643345540 in words is "twenty-three trillion, twenty-one billion, six hundred forty-three million, three hundred forty-five thousand, five hundred forty".