21024394783 has 16 divisors (see below), whose sum is σ = 25294473216. Its totient is φ = 17084833920.

The previous prime is 21024394777. The next prime is 21024394789. The reversal of 21024394783 is 38749342012.

It is an interprime number because it is at equal distance from previous prime (21024394777) and next prime (21024394789).

It is not a de Polignac number, because 21024394783 - 2⁹ = 21024394271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21024394789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 559623 + ... + 596008.

It is an arithmetic number, because the mean of its divisors is an integer number (1580904576).

Almost surely, 2^21024394783 is an apocalyptic number.

21024394783 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21024394783 is a deficient number, since it is larger than the sum of its proper divisors (4270078433).

21024394783 is a wasteful number, since it uses less digits than its factorization.

21024394783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155774.

The product of its (nonzero) digits is 290304, while the sum is 43.

The spelling of 21024394783 in words is "twenty-one billion, twenty-four million, three hundred ninety-four thousand, seven hundred eighty-three".