21041433355551 has 8 divisors (see below), whose sum is σ = 32063136541824. Its totient is φ = 12023676203160.

The previous prime is 21041433355529. The next prime is 21041433355597. The reversal of 21041433355551 is 15555333414012.

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

It is not a de Polignac number, because 21041433355551 - 2⁹ = 21041433355039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041433355511) 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, 500986508445 + ... + 500986508486.

It is an arithmetic number, because the mean of its divisors is an integer number (4007892067728).

Almost surely, 2^{21041433355551} is an apocalyptic number.

21041433355551 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21041433355551 is a deficient number, since it is larger than the sum of its proper divisors (11021703186273).

21041433355551 is a wasteful number, since it uses less digits than its factorization.

21041433355551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001973016941.

The product of its (nonzero) digits is 540000, while the sum is 42.

Adding to 21041433355551 its reverse (15555333414012), we get a palindrome (36596766769563).

The spelling of 21041433355551 in words is "twenty-one trillion, forty-one billion, four hundred thirty-three million, three hundred fifty-five thousand, five hundred fifty-one".