21580676501 has 4 divisors (see below), whose sum is σ = 22716501600. Its totient is φ = 20444851404.

The previous prime is 21580676489. The next prime is 21580676519. The reversal of 21580676501 is 10567608512.

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 21580676501 - 2³⁴ = 4400807317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21580676591) 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, 567912521 + ... + 567912558.

It is an arithmetic number, because the mean of its divisors is an integer number (5679125400).

Almost surely, 2^21580676501 is an apocalyptic number.

It is an amenable number.

21580676501 is a deficient number, since it is larger than the sum of its proper divisors (1135825099).

21580676501 is a wasteful number, since it uses less digits than its factorization.

21580676501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1135825098.

The product of its (nonzero) digits is 100800, while the sum is 41.

The spelling of 21580676501 in words is "twenty-one billion, five hundred eighty million, six hundred seventy-six thousand, five hundred one".