21503034311044 has 72 divisors (see below), whose sum is σ = 44572544976960. Its totient is φ = 9016460840640.

The previous prime is 21503034310991. The next prime is 21503034311051. The reversal of 21503034311044 is 44011343030512.

It is a junction number, because it is equal to n+sod(n) for n = 21503034310997 and 21503034311015.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8713167 + ... + 10905289.

It is an arithmetic number, because the mean of its divisors is an integer number (619063124680).

Almost surely, 2^{21503034311044} is an apocalyptic number.

It is an amenable number.

21503034311044 is an abundant number, since it is smaller than the sum of its proper divisors (23069510665916).

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

21503034311044 is a wasteful number, since it uses less digits than its factorization.

21503034311044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2193721 (or 2193708 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

Adding to 21503034311044 its reverse (44011343030512), we get a palindrome (65514377341556).

The spelling of 21503034311044 in words is "twenty-one trillion, five hundred three billion, thirty-four million, three hundred eleven thousand, forty-four".