21072461465 has 16 divisors (see below), whose sum is σ = 27595460160. Its totient is φ = 15320041920.

The previous prime is 21072461413. The next prime is 21072461477. The reversal of 21072461465 is 56416427012.

It is a happy number.

It is not a de Polignac number, because 21072461465 - 2²⁶ = 21005352601 is a prime.

It is a Curzon 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, 94142 + ... + 225848.

It is an arithmetic number, because the mean of its divisors is an integer number (1724716260).

Almost surely, 2^21072461465 is an apocalyptic number.

It is an amenable number.

21072461465 is a deficient number, since it is larger than the sum of its proper divisors (6522998695).

21072461465 is a wasteful number, since it uses less digits than its factorization.

21072461465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134632.

The product of its (nonzero) digits is 80640, while the sum is 38.

Adding to 21072461465 its reverse (56416427012), we get a palindrome (77488888477).

The spelling of 21072461465 in words is "twenty-one billion, seventy-two million, four hundred sixty-one thousand, four hundred sixty-five".