21502024525340 has 24 divisors (see below), whose sum is σ = 45282167244720. Its totient is φ = 8576444907008.

The previous prime is 21502024525321. The next prime is 21502024525381. The reversal of 21502024525340 is 4352542020512.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21502024525340.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1522799210 + ... + 1522813329.

It is an arithmetic number, because the mean of its divisors is an integer number (1886756968530).

Almost surely, 2^{21502024525340} is an apocalyptic number.

21502024525340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21502024525340 is an abundant number, since it is smaller than the sum of its proper divisors (23780142719380).

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

21502024525340 is a wasteful number, since it uses less digits than its factorization.

21502024525340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3045612901 (or 3045612899 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 35.

Adding to 21502024525340 its reverse (4352542020512), we get a palindrome (25854566545852).

The spelling of 21502024525340 in words is "twenty-one trillion, five hundred two billion, twenty-four million, five hundred twenty-five thousand, three hundred forty".