21441520540251 has 24 divisors (see below), whose sum is σ = 35395820079360. Its totient is φ = 12252195644976.

The previous prime is 21441520540207. The next prime is 21441520540259. The reversal of 21441520540251 is 15204502514412.

21441520540251 is a `hidden beast` number, since 2 + 1 + 4 + 41 + 5 + 20 + 540 + 2 + 51 = 666.

It is not a de Polignac number, because 21441520540251 - 2¹⁰ = 21441520539227 is a prime.

It is a super-2 number, since 2×21441520540251² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21441520540259) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6584416 + ... + 9286418.

It is an arithmetic number, because the mean of its divisors is an integer number (1474825836640).

Almost surely, 2^{21441520540251} is an apocalyptic number.

21441520540251 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21441520540251 is a deficient number, since it is larger than the sum of its proper divisors (13954299539109).

21441520540251 is a wasteful number, since it uses less digits than its factorization.

21441520540251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2827975 (or 2827972 counting only the distinct ones).

The product of its (nonzero) digits is 64000, while the sum is 36.

The spelling of 21441520540251 in words is "twenty-one trillion, four hundred forty-one billion, five hundred twenty million, five hundred forty thousand, two hundred fifty-one".