21441554544025 has 48 divisors (see below), whose sum is σ = 33252655443840. Its totient is φ = 13323998937600.

The previous prime is 21441554544023. The next prime is 21441554544127. The reversal of 21441554544025 is 52044545514412.

It is a happy number.

It is not a de Polignac number, because 21441554544025 - 2¹ = 21441554544023 is a prime.

It is a super-4 number, since 4×21441554544025⁴ (a number of 54 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (21441554544023) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16958340 + ... + 18178789.

It is an arithmetic number, because the mean of its divisors is an integer number (692763655080).

Almost surely, 2^{21441554544025} is an apocalyptic number.

21441554544025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21441554544025 is a deficient number, since it is larger than the sum of its proper divisors (11811100899815).

21441554544025 is a wasteful number, since it uses less digits than its factorization.

21441554544025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35137474 (or 35137469 counting only the distinct ones).

The product of its (nonzero) digits is 2560000, while the sum is 46.

The spelling of 21441554544025 in words is "twenty-one trillion, four hundred forty-one billion, five hundred fifty-four million, five hundred forty-four thousand, twenty-five".