21503303410440 has 64 divisors (see below), whose sum is σ = 64512219576960. Its totient is φ = 5734008967680.

The previous prime is 21503303410429. The next prime is 21503303410553. The reversal of 21503303410440 is 4401430330512.

It is a super-2 number, since 2×21503303410440² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 21503303410398 and 21503303410407.

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, 173445 + ... + 6560235.

It is an arithmetic number, because the mean of its divisors is an integer number (1008003430890).

Almost surely, 2^{21503303410440} is an apocalyptic number.

21503303410440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21503303410440 is an abundant number, since it is smaller than the sum of its proper divisors (43008916166520).

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

21503303410440 is a wasteful number, since it uses less digits than its factorization.

21503303410440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6414862 (or 6414858 counting only the distinct ones).

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

Adding to 21503303410440 its reverse (4401430330512), we get a palindrome (25904733740952).

The spelling of 21503303410440 in words is "twenty-one trillion, five hundred three billion, three hundred three million, four hundred ten thousand, four hundred forty".