21341797565 has 16 divisors (see below), whose sum is σ = 28105660800. Its totient is φ = 15428358720.

The previous prime is 21341797559. The next prime is 21341797571. The reversal of 21341797565 is 56579714312.

It is an interprime number because it is at equal distance from previous prime (21341797559) and next prime (21341797571).

It is not a de Polignac number, because 21341797565 - 2¹⁶ = 21341732029 is a prime.

It is a Curzon number.

It is a congruent 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, 1152590 + ... + 1170959.

It is an arithmetic number, because the mean of its divisors is an integer number (1756603800).

Almost surely, 2^21341797565 is an apocalyptic number.

It is an amenable number.

21341797565 is a deficient number, since it is larger than the sum of its proper divisors (6763863235).

21341797565 is a wasteful number, since it uses less digits than its factorization.

21341797565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2323732.

The product of its digits is 1587600, while the sum is 50.

The spelling of 21341797565 in words is "twenty-one billion, three hundred forty-one million, seven hundred ninety-seven thousand, five hundred sixty-five".