21202303042740 has 192 divisors, whose sum is σ = 63457497815040. Its totient is φ = 5273613734400.

The previous prime is 21202303042729. The next prime is 21202303042763. The reversal of 21202303042740 is 4724030320212.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 21202303042698 and 21202303042707.

It is a congruent number.

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, 145125369 + ... + 145271391.

It is an arithmetic number, because the mean of its divisors is an integer number (330507801120).

Almost surely, 2^{21202303042740} is an apocalyptic number.

21202303042740 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 21202303042740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31728748907520).

21202303042740 is an abundant number, since it is smaller than the sum of its proper divisors (42255194772300).

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

21202303042740 is a wasteful number, since it uses less digits than its factorization.

21202303042740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148022 (or 148020 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 30.

Adding to 21202303042740 its reverse (4724030320212), we get a palindrome (25926333362952).

The spelling of 21202303042740 in words is "twenty-one trillion, two hundred two billion, three hundred three million, forty-two thousand, seven hundred forty".