21503003044445 has 48 divisors (see below), whose sum is σ = 28298056550400. Its totient is φ = 15676371210240.

The previous prime is 21503003044433. The next prime is 21503003044507. The reversal of 21503003044445 is 54444030030512.

It is not a de Polignac number, because 21503003044445 - 2¹⁴ = 21503003028061 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1027415741 + ... + 1027436669.

It is an arithmetic number, because the mean of its divisors is an integer number (589542844800).

Almost surely, 2^{21503003044445} is an apocalyptic number.

It is an amenable number.

21503003044445 is a deficient number, since it is larger than the sum of its proper divisors (6795053505955).

21503003044445 is a wasteful number, since it uses less digits than its factorization.

21503003044445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36430 (or 36417 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 35.

Adding to 21503003044445 its reverse (54444030030512), we get a palindrome (75947033074957).

The spelling of 21503003044445 in words is "twenty-one trillion, five hundred three billion, three million, forty-four thousand, four hundred forty-five".