21003113065 has 16 divisors (see below), whose sum is σ = 27826255296. Its totient is φ = 15090952000.

The previous prime is 21003112993. The next prime is 21003113081. The reversal of 21003113065 is 56031130012.

It is a happy number.

It is not a de Polignac number, because 21003113065 - 2³¹ = 18855629417 is a prime.

It is a super-2 number, since 2×21003113065² (a number of 21 digits) contains 22 as substring.

It is a Duffinian 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, 2295886 + ... + 2305015.

It is an arithmetic number, because the mean of its divisors is an integer number (1739140956).

Almost surely, 2^21003113065 is an apocalyptic number.

It is an amenable number.

21003113065 is a deficient number, since it is larger than the sum of its proper divisors (6823142231).

21003113065 is a wasteful number, since it uses less digits than its factorization.

21003113065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4601000.

The product of its (nonzero) digits is 540, while the sum is 22.

Adding to 21003113065 its reverse (56031130012), we get a palindrome (77034243077).

The spelling of 21003113065 in words is "twenty-one billion, three million, one hundred thirteen thousand, sixty-five".