21403795 has 16 divisors (see below), whose sum is σ = 30302208. Its totient is φ = 14202720.

The previous prime is 21403787. The next prime is 21403801. The reversal of 21403795 is 59730412.

It is not a de Polignac number, because 21403795 - 2³ = 21403787 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8779 + ... + 10948.

It is an arithmetic number, because the mean of its divisors is an integer number (1893888).

Almost surely, 2^21403795 is an apocalyptic number.

21403795 is a deficient number, since it is larger than the sum of its proper divisors (8898413).

21403795 is a wasteful number, since it uses less digits than its factorization.

21403795 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19770.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 21403795 is about 4626.4235646988. The cubic root of 21403795 is about 277.6495203744.

The spelling of 21403795 in words is "twenty-one million, four hundred three thousand, seven hundred ninety-five".