21901795 has 8 divisors (see below), whose sum is σ = 26457120. Its totient is φ = 17404800.

The previous prime is 21901793. The next prime is 21901799. The reversal of 21901795 is 59710912.

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

It is not a de Polignac number, because 21901795 - 2¹ = 21901793 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21901795.

It is not an unprimeable number, because it can be changed into a prime (21901793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13750 + ... + 15259.

It is an arithmetic number, because the mean of its divisors is an integer number (3307140).

Almost surely, 2^21901795 is an apocalyptic number.

21901795 is a deficient number, since it is larger than the sum of its proper divisors (4555325).

21901795 is a wasteful number, since it uses less digits than its factorization.

21901795 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29165.

The product of its (nonzero) digits is 5670, while the sum is 34.

The square root of 21901795 is about 4679.9353628015. The cubic root of 21901795 is about 279.7863804327.

The spelling of 21901795 in words is "twenty-one million, nine hundred one thousand, seven hundred ninety-five".