21409795 has 8 divisors (see below), whose sum is σ = 28027440. Its totient is φ = 15570720.

The previous prime is 21409793. The next prime is 21409807. The reversal of 21409795 is 59790412.

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

It is not a de Polignac number, because 21409795 - 2¹ = 21409793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21409793) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194580 + ... + 194689.

It is an arithmetic number, because the mean of its divisors is an integer number (3503430).

Almost surely, 2^21409795 is an apocalyptic number.

21409795 is a deficient number, since it is larger than the sum of its proper divisors (6617645).

21409795 is a wasteful number, since it uses less digits than its factorization.

21409795 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389285.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 21409795 is about 4627.0719683186. The cubic root of 21409795 is about 277.6754619031.

It can be divided in two parts, 2140 and 9795, that added together give a triangular number (11935 = T₁₅₄).

The spelling of 21409795 in words is "twenty-one million, four hundred nine thousand, seven hundred ninety-five".