21355522743 has 8 divisors (see below), whose sum is σ = 28735260400. Its totient is φ = 14106400128.

The previous prime is 21355522733. The next prime is 21355522759. The reversal of 21355522743 is 34722555312.

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

It is not a de Polignac number, because 21355522743 - 2⁶ = 21355522679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21355522733) 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, 32653378 + ... + 32654031.

It is an arithmetic number, because the mean of its divisors is an integer number (3591907550).

Almost surely, 2^21355522743 is an apocalyptic number.

21355522743 is a deficient number, since it is larger than the sum of its proper divisors (7379737657).

21355522743 is a wasteful number, since it uses less digits than its factorization.

21355522743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65307521.

The product of its digits is 252000, while the sum is 39.

The spelling of 21355522743 in words is "twenty-one billion, three hundred fifty-five million, five hundred twenty-two thousand, seven hundred forty-three".