21341000521 has 4 divisors (see below), whose sum is σ = 21540449232. Its totient is φ = 21141551812.

The previous prime is 21341000509. The next prime is 21341000533. The reversal of 21341000521 is 12500014312.

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 an interprime number because it is at equal distance from previous prime (21341000509) and next prime (21341000533).

It is a cyclic number.

It is not a de Polignac number, because 21341000521 - 2¹³ = 21340992329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21341000561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99724195 + ... + 99724408.

It is an arithmetic number, because the mean of its divisors is an integer number (5385112308).

Almost surely, 2^21341000521 is an apocalyptic number.

It is an amenable number.

21341000521 is a deficient number, since it is larger than the sum of its proper divisors (199448711).

21341000521 is a wasteful number, since it uses less digits than its factorization.

21341000521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199448710.

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 21341000521 its reverse (12500014312), we get a palindrome (33841014833).

The spelling of 21341000521 in words is "twenty-one billion, three hundred forty-one million, five hundred twenty-one", and thus it is an aban number.