21357711043 has 2 divisors, whose sum is σ = 21357711044. Its totient is φ = 21357711042.

The previous prime is 21357711017. The next prime is 21357711049. The reversal of 21357711043 is 34011775312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21357711043 - 2³³ = 12767776451 is a prime.

It is not a weakly prime, because it can be changed into another prime (21357711049) 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 as a sum of consecutive naturals, namely, 10678855521 + 10678855522.

It is an arithmetic number, because the mean of its divisors is an integer number (10678855522).

Almost surely, 2^21357711043 is an apocalyptic number.

21357711043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21357711043 is an equidigital number, since it uses as much as digits as its factorization.

21357711043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17640, while the sum is 34.

The spelling of 21357711043 in words is "twenty-one billion, three hundred fifty-seven million, seven hundred eleven thousand, forty-three".