21040463265 has 8 divisors (see below), whose sum is σ = 33664741248. Its totient is φ = 11221580400.

The previous prime is 21040463261. The next prime is 21040463303. The reversal of 21040463265 is 56236404012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21040463265 - 2² = 21040463261 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21040463261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 701348761 + ... + 701348790.

It is an arithmetic number, because the mean of its divisors is an integer number (4208092656).

Almost surely, 2^21040463265 is an apocalyptic number.

It is an amenable number.

21040463265 is a deficient number, since it is larger than the sum of its proper divisors (12624277983).

21040463265 is a wasteful number, since it uses less digits than its factorization.

21040463265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1402697559.

The product of its (nonzero) digits is 34560, while the sum is 33.

Adding to 21040463265 its reverse (56236404012), we get a palindrome (77276867277).

The spelling of 21040463265 in words is "twenty-one billion, forty million, four hundred sixty-three thousand, two hundred sixty-five".