21356335757443 has 8 divisors (see below), whose sum is σ = 21367550010240. Its totient is φ = 21345122423040.

The previous prime is 21356335757377. The next prime is 21356335757461. The reversal of 21356335757443 is 34475753365312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21356335757443 - 2¹³ = 21356335749251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21356335757143) 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, 49055118 + ... + 49488556.

It is an arithmetic number, because the mean of its divisors is an integer number (2670943751280).

Almost surely, 2^{21356335757443} is an apocalyptic number.

21356335757443 is a deficient number, since it is larger than the sum of its proper divisors (11214252797).

21356335757443 is a wasteful number, since it uses less digits than its factorization.

21356335757443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459197.

The product of its digits is 95256000, while the sum is 58.

The spelling of 21356335757443 in words is "twenty-one trillion, three hundred fifty-six billion, three hundred thirty-five million, seven hundred fifty-seven thousand, four hundred forty-three".