21434451550541 has 8 divisors (see below), whose sum is σ = 21474536144568. Its totient is φ = 21394398240000.

The previous prime is 21434451550537. The next prime is 21434451550549. The reversal of 21434451550541 is 14505515443412.

It can be written as a sum of positive squares in 4 ways, for example, as 751775702500 + 20682675848041 = 867050^2 + 4547821^2 .

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 21434451550541 - 2² = 21434451550537 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21434451550492 and 21434451550501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21434451550549) 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, 6449030 + ... + 9190151.

It is an arithmetic number, because the mean of its divisors is an integer number (2684317018071).

Almost surely, 2^{21434451550541} is an apocalyptic number.

It is an amenable number.

21434451550541 is a deficient number, since it is larger than the sum of its proper divisors (40084594027).

21434451550541 is a wasteful number, since it uses less digits than its factorization.

21434451550541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15641743.

The product of its (nonzero) digits is 960000, while the sum is 44.

Adding to 21434451550541 its reverse (14505515443412), we get a palindrome (35939966993953).

The spelling of 21434451550541 in words is "twenty-one trillion, four hundred thirty-four billion, four hundred fifty-one million, five hundred fifty thousand, five hundred forty-one".