21030024321240 has 64 divisors (see below), whose sum is σ = 68825534146560. Its totient is φ = 5098187713920.

The previous prime is 21030024321227. The next prime is 21030024321391. The reversal of 21030024321240 is 4212342003012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 21030024321240.

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, 7965916984 + ... + 7965919623.

It is an arithmetic number, because the mean of its divisors is an integer number (1075398971040).

Almost surely, 2^{21030024321240} is an apocalyptic number.

21030024321240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21030024321240 is an abundant number, since it is smaller than the sum of its proper divisors (47795509825320).

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

21030024321240 is a wasteful number, since it uses less digits than its factorization.

21030024321240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15931836632 (or 15931836628 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21030024321240 its reverse (4212342003012), we get a palindrome (25242366324252).

The spelling of 21030024321240 in words is "twenty-one trillion, thirty billion, twenty-four million, three hundred twenty-one thousand, two hundred forty".