21503040442324 has 12 divisors (see below), whose sum is σ = 43006080884704. Its totient is φ = 9215588760984.

The previous prime is 21503040442291. The next prime is 21503040442379. The reversal of 21503040442324 is 42324404030512.

21503040442324 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 21503040442324.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 383982865014 + ... + 383982865069.

Almost surely, 2^{21503040442324} is an apocalyptic number.

It is an amenable number.

21503040442324 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21503040442324 is a wasteful number, since it uses less digits than its factorization.

21503040442324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767965730094 (or 767965730092 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 34.

Adding to 21503040442324 its reverse (42324404030512), we get a palindrome (63827444472836).

The spelling of 21503040442324 in words is "twenty-one trillion, five hundred three billion, forty million, four hundred forty-two thousand, three hundred twenty-four".