21503163160416 has 96 divisors (see below), whose sum is σ = 64525336017408. Its totient is φ = 6142251709440.

The previous prime is 21503163160313. The next prime is 21503163160483. The reversal of 21503163160416 is 61406136130512.

It is a tau number, because it is divible by the number of its divisors (96).

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, 1191100 + ... + 6665211.

It is an arithmetic number, because the mean of its divisors is an integer number (672138916848).

Almost surely, 2^{21503163160416} is an apocalyptic number.

It is an amenable number.

21503163160416 is an abundant number, since it is smaller than the sum of its proper divisors (43022172856992).

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

21503163160416 is a wasteful number, since it uses less digits than its factorization.

21503163160416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7860404 (or 7860396 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 39.

Adding to 21503163160416 its reverse (61406136130512), we get a palindrome (82909299290928).

The spelling of 21503163160416 in words is "twenty-one trillion, five hundred three billion, one hundred sixty-three million, one hundred sixty thousand, four hundred sixteen".