21451054532041 has 4 divisors (see below), whose sum is σ = 21974250984084. Its totient is φ = 20927858080000.

The previous prime is 21451054532021. The next prime is 21451054532057. The reversal of 21451054532041 is 14023545015412.

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 3629958510025 + 17821096022016 = 1905245^2 + 4221504^2 .

It is a cyclic number.

It is not a de Polignac number, because 21451054532041 - 2¹⁹ = 21451054007753 is a prime.

It is a super-4 number, since 4×21451054532041⁴ (a number of 54 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21451054532021) 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, 261598225960 + ... + 261598226041.

It is an arithmetic number, because the mean of its divisors is an integer number (5493562746021).

Almost surely, 2^{21451054532041} is an apocalyptic number.

It is an amenable number.

21451054532041 is a deficient number, since it is larger than the sum of its proper divisors (523196452043).

21451054532041 is an equidigital number, since it uses as much as digits as its factorization.

21451054532041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523196452042.

The product of its (nonzero) digits is 96000, while the sum is 37.

Adding to 21451054532041 its reverse (14023545015412), we get a palindrome (35474599547453).

The spelling of 21451054532041 in words is "twenty-one trillion, four hundred fifty-one billion, fifty-four million, five hundred thirty-two thousand, forty-one".