21503034210324 has 24 divisors (see below), whose sum is σ = 50192199581440. Its totient is φ = 7165041914304.

The previous prime is 21503034210241. The next prime is 21503034210337. The reversal of 21503034210324 is 42301243030512.

It is a junction number, because it is equal to n+sod(n) for n = 21503034210291 and 21503034210300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 329485489 + ... + 329550744.

Almost surely, 2^{21503034210324} is an apocalyptic number.

It is an amenable number.

21503034210324 is an abundant number, since it is smaller than the sum of its proper divisors (28689165371116).

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

21503034210324 is a wasteful number, since it uses less digits than its factorization.

21503034210324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659038959 (or 659038957 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

Adding to 21503034210324 its reverse (42301243030512), we get a palindrome (63804277240836).

The spelling of 21503034210324 in words is "twenty-one trillion, five hundred three billion, thirty-four million, two hundred ten thousand, three hundred twenty-four".