21454521102425 has 12 divisors (see below), whose sum is σ = 26603679991740. Its totient is φ = 17163569253120.

The previous prime is 21454521102397. The next prime is 21454521102527. The reversal of 21454521102425 is 52420112545412.

It can be written as a sum of positive squares in 6 ways, for example, as 31471824409 + 21423049278016 = 177403^2 + 4628504^2 .

It is not a de Polignac number, because 21454521102425 - 2⁸ = 21454521102169 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10096421 + ... + 12035229.

It is an arithmetic number, because the mean of its divisors is an integer number (2216973332645).

Almost surely, 2^{21454521102425} is an apocalyptic number.

21454521102425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21454521102425 is a deficient number, since it is larger than the sum of its proper divisors (5149158889315).

21454521102425 is a wasteful number, since it uses less digits than its factorization.

21454521102425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2381452 (or 2381447 counting only the distinct ones).

The product of its (nonzero) digits is 128000, while the sum is 38.

Adding to 21454521102425 its reverse (52420112545412), we get a palindrome (73874633647837).

The spelling of 21454521102425 in words is "twenty-one trillion, four hundred fifty-four billion, five hundred twenty-one million, one hundred two thousand, four hundred twenty-five".