21795782501 has 8 divisors (see below), whose sum is σ = 23179556160. Its totient is φ = 20423305408.

The previous prime is 21795782483. The next prime is 21795782513. The reversal of 21795782501 is 10528759712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21795782501 is a prime.

It is a super-2 number, since 2×21795782501² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21795782521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2820161 + ... + 2827878.

It is an arithmetic number, because the mean of its divisors is an integer number (2897444520).

Almost surely, 2^21795782501 is an apocalyptic number.

It is an amenable number.

21795782501 is a deficient number, since it is larger than the sum of its proper divisors (1383773659).

21795782501 is a wasteful number, since it uses less digits than its factorization.

21795782501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5648283.

The product of its (nonzero) digits is 352800, while the sum is 47.

The spelling of 21795782501 in words is "twenty-one billion, seven hundred ninety-five million, seven hundred eighty-two thousand, five hundred one".