21137782843 has 2 divisors, whose sum is σ = 21137782844. Its totient is φ = 21137782842.

The previous prime is 21137782829. The next prime is 21137782859. The reversal of 21137782843 is 34828773112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21137782843 is a prime.

It is a super-3 number, since 3×21137782843³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21137782793 and 21137782802.

It is not a weakly prime, because it can be changed into another prime (21137780843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10568891421 + 10568891422.

It is an arithmetic number, because the mean of its divisors is an integer number (10568891422).

Almost surely, 2^21137782843 is an apocalyptic number.

21137782843 is a deficient number, since it is larger than the sum of its proper divisors (1).

21137782843 is an equidigital number, since it uses as much as digits as its factorization.

21137782843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 451584, while the sum is 46.

The spelling of 21137782843 in words is "twenty-one billion, one hundred thirty-seven million, seven hundred eighty-two thousand, eight hundred forty-three".