21106471465 has 32 divisors (see below), whose sum is σ = 27251116416. Its totient is φ = 15637017600.

The previous prime is 21106471457. The next prime is 21106471481. The reversal of 21106471465 is 56417460112.

It is not a de Polignac number, because 21106471465 - 2³ = 21106471457 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1391814 + ... + 1406896.

It is an arithmetic number, because the mean of its divisors is an integer number (851597388).

Almost surely, 2^21106471465 is an apocalyptic number.

It is an amenable number.

21106471465 is a deficient number, since it is larger than the sum of its proper divisors (6144644951).

21106471465 is a wasteful number, since it uses less digits than its factorization.

21106471465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15369.

The product of its (nonzero) digits is 40320, while the sum is 37.

It can be divided in two parts, 2110647 and 1465, that added together give a palindrome (2112112).

The spelling of 21106471465 in words is "twenty-one billion, one hundred six million, four hundred seventy-one thousand, four hundred sixty-five".