21820404783 has 16 divisors (see below), whose sum is σ = 30636279680. Its totient is φ = 13776290784.

The previous prime is 21820404709. The next prime is 21820404833. The reversal of 21820404783 is 38740402812.

It is not a de Polignac number, because 21820404783 - 2¹² = 21820400687 is a prime.

It is a super-2 number, since 2×21820404783² (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 (21820404583) 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 15 ways as a sum of consecutive naturals, for example, 91485 + ... + 228057.

It is an arithmetic number, because the mean of its divisors is an integer number (1914767480).

Almost surely, 2^21820404783 is an apocalyptic number.

21820404783 is a deficient number, since it is larger than the sum of its proper divisors (8815874897).

21820404783 is a wasteful number, since it uses less digits than its factorization.

21820404783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139398.

The product of its (nonzero) digits is 86016, while the sum is 39.

The spelling of 21820404783 in words is "twenty-one billion, eight hundred twenty million, four hundred four thousand, seven hundred eighty-three".