21101101134433 has 4 divisors (see below), whose sum is σ = 21101579347140. Its totient is φ = 21100622921728.

The previous prime is 21101101134413. The next prime is 21101101134461. The reversal of 21101101134433 is 33443110110112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9384836187024 + 11716264947409 = 3063468^2 + 3422903^2 .

It is a cyclic number.

It is not a de Polignac number, because 21101101134433 - 2²¹ = 21101099037281 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21101101134398 and 21101101134407.

It is not an unprimeable number, because it can be changed into a prime (21101101134403) 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, 239040160 + ... + 239128417.

It is an arithmetic number, because the mean of its divisors is an integer number (5275394836785).

Almost surely, 2^{21101101134433} is an apocalyptic number.

It is an amenable number.

21101101134433 is a deficient number, since it is larger than the sum of its proper divisors (478212707).

21101101134433 is an equidigital number, since it uses as much as digits as its factorization.

21101101134433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478212706.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 21101101134433 its reverse (33443110110112), we get a palindrome (54544211244545).

The spelling of 21101101134433 in words is "twenty-one trillion, one hundred one billion, one hundred one million, one hundred thirty-four thousand, four hundred thirty-three".