21871422465 has 8 divisors (see below), whose sum is σ = 34994275968. Its totient is φ = 11664758640.

The previous prime is 21871422451. The next prime is 21871422473. The reversal of 21871422465 is 56422417812.

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

It is not a de Polignac number, because 21871422465 - 2⁷ = 21871422337 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 729047401 + ... + 729047430.

It is an arithmetic number, because the mean of its divisors is an integer number (4374284496).

Almost surely, 2^21871422465 is an apocalyptic number.

It is an amenable number.

21871422465 is a deficient number, since it is larger than the sum of its proper divisors (13122853503).

21871422465 is a wasteful number, since it uses less digits than its factorization.

21871422465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458094839.

The product of its digits is 215040, while the sum is 42.

The spelling of 21871422465 in words is "twenty-one billion, eight hundred seventy-one million, four hundred twenty-two thousand, four hundred sixty-five".