21137574343 has 2 divisors, whose sum is σ = 21137574344. Its totient is φ = 21137574342.

The previous prime is 21137574229. The next prime is 21137574361. The reversal of 21137574343 is 34347573112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21137574343 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21137574296 and 21137574305.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21137574443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10568787171 + 10568787172.

It is an arithmetic number, because the mean of its divisors is an integer number (10568787172).

Almost surely, 2^21137574343 is an apocalyptic number.

21137574343 is a deficient number, since it is larger than the sum of its proper divisors (1).

21137574343 is an equidigital number, since it uses as much as digits as its factorization.

21137574343 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 40.

The spelling of 21137574343 in words is "twenty-one billion, one hundred thirty-seven million, five hundred seventy-four thousand, three hundred forty-three".