21355342450069 has 4 divisors (see below), whose sum is σ = 22283835600096. Its totient is φ = 20426849300044.

The previous prime is 21355342450067. The next prime is 21355342450111. The reversal of 21355342450069 is 96005424355312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21355342450069 - 2¹ = 21355342450067 is a prime.

It is a super-2 number, since 2×21355342450069² (a number of 27 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21355342450061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 464246574979 + ... + 464246575024.

It is an arithmetic number, because the mean of its divisors is an integer number (5570958900024).

Almost surely, 2^{21355342450069} is an apocalyptic number.

It is an amenable number.

21355342450069 is a deficient number, since it is larger than the sum of its proper divisors (928493150027).

21355342450069 is an equidigital number, since it uses as much as digits as its factorization.

21355342450069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 928493150026.

The product of its (nonzero) digits is 3888000, while the sum is 49.

The spelling of 21355342450069 in words is "twenty-one trillion, three hundred fifty-five billion, three hundred forty-two million, four hundred fifty thousand, sixty-nine".