21717701461 has 4 divisors (see below), whose sum is σ = 22860738400. Its totient is φ = 20574664524.

The previous prime is 21717701459. The next prime is 21717701471. The reversal of 21717701461 is 16410771712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21717701461 - 2¹ = 21717701459 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21717701461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21717701431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 571518441 + ... + 571518478.

It is an arithmetic number, because the mean of its divisors is an integer number (5715184600).

Almost surely, 2^21717701461 is an apocalyptic number.

It is an amenable number.

21717701461 is a deficient number, since it is larger than the sum of its proper divisors (1143036939).

21717701461 is a wasteful number, since it uses less digits than its factorization.

21717701461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1143036938.

The product of its (nonzero) digits is 16464, while the sum is 37.

The spelling of 21717701461 in words is "twenty-one billion, seven hundred seventeen million, seven hundred one thousand, four hundred sixty-one".