21719750834 has 16 divisors (see below), whose sum is σ = 34715803608. Its totient is φ = 10155954432.

The previous prime is 21719750831. The next prime is 21719750837. The reversal of 21719750834 is 43805791712.

It is an interprime number because it is at equal distance from previous prime (21719750831) and next prime (21719750837).

It can be written as a sum of positive squares in 4 ways, for example, as 19769203609 + 1950547225 = 140603^2 + 44165^2 .

It is not an unprimeable number, because it can be changed into a prime (21719750831) 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, 2029109 + ... + 2039784.

Almost surely, 2^21719750834 is an apocalyptic number.

21719750834 is a deficient number, since it is larger than the sum of its proper divisors (12996052774).

21719750834 is a wasteful number, since it uses less digits than its factorization.

21719750834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4069069.

The product of its (nonzero) digits is 423360, while the sum is 47.

The spelling of 21719750834 in words is "twenty-one billion, seven hundred nineteen million, seven hundred fifty thousand, eight hundred thirty-four".