21305414540 has 12 divisors (see below), whose sum is σ = 44741370576. Its totient is φ = 8522165808.

The previous prime is 21305414527. The next prime is 21305414569. The reversal of 21305414540 is 4541450312.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 532635344 + ... + 532635383.

It is an arithmetic number, because the mean of its divisors is an integer number (3728447548).

Almost surely, 2^21305414540 is an apocalyptic number.

21305414540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21305414540 is an abundant number, since it is smaller than the sum of its proper divisors (23435956036).

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

21305414540 is a wasteful number, since it uses less digits than its factorization.

21305414540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065270736 (or 1065270734 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 21305414540 its reverse (4541450312), we get a palindrome (25846864852).

The spelling of 21305414540 in words is "twenty-one billion, three hundred five million, four hundred fourteen thousand, five hundred forty".