21410077565 has 16 divisors (see below), whose sum is σ = 26576336640. Its totient is φ = 16545228480.

The previous prime is 21410077561. The next prime is 21410077567. The reversal of 21410077565 is 56577001412.

It is not a de Polignac number, because 21410077565 - 2² = 21410077561 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21410077561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 390581 + ... + 442010.

It is an arithmetic number, because the mean of its divisors is an integer number (1661021040).

Almost surely, 2^21410077565 is an apocalyptic number.

It is an amenable number.

21410077565 is a deficient number, since it is larger than the sum of its proper divisors (5166259075).

21410077565 is a wasteful number, since it uses less digits than its factorization.

21410077565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832772.

The product of its (nonzero) digits is 58800, while the sum is 38.

Adding to 21410077565 its reverse (56577001412), we get a palindrome (77987078977).

The spelling of 21410077565 in words is "twenty-one billion, four hundred ten million, seventy-seven thousand, five hundred sixty-five".