21554343032041 has 4 divisors (see below), whose sum is σ = 21752089298500. Its totient is φ = 21356596765584.

The previous prime is 21554343032039. The next prime is 21554343032081. The reversal of 21554343032041 is 14023034345512.

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 13332933742041 + 8221409290000 = 3651429^2 + 2867300^2 .

It is a cyclic number.

It is not a de Polignac number, because 21554343032041 - 2¹ = 21554343032039 is a prime.

It is a super-3 number, since 3×21554343032041³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21554343032081) 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, 98873133066 + ... + 98873133283.

It is an arithmetic number, because the mean of its divisors is an integer number (5438022324625).

Almost surely, 2^{21554343032041} is an apocalyptic number.

It is an amenable number.

21554343032041 is a deficient number, since it is larger than the sum of its proper divisors (197746266459).

21554343032041 is a wasteful number, since it uses less digits than its factorization.

21554343032041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197746266458.

The product of its (nonzero) digits is 172800, while the sum is 37.

Adding to 21554343032041 its reverse (14023034345512), we get a palindrome (35577377377553).

The spelling of 21554343032041 in words is "twenty-one trillion, five hundred fifty-four billion, three hundred forty-three million, thirty-two thousand, forty-one".