21457565110439 has 16 divisors (see below), whose sum is σ = 22228714422720. Its totient is φ = 20688504130560.

The previous prime is 21457565110411. The next prime is 21457565110459. The reversal of 21457565110439 is 93401156575412.

It is a cyclic number.

It is not a de Polignac number, because 21457565110439 - 2⁸ = 21457565110183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21457565110459) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 217328294 + ... + 217427004.

It is an arithmetic number, because the mean of its divisors is an integer number (1389294651420).

Almost surely, 2^{21457565110439} is an apocalyptic number.

21457565110439 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

21457565110439 is a deficient number, since it is larger than the sum of its proper divisors (771149312281).

21457565110439 is an equidigital number, since it uses as much as digits as its factorization.

21457565110439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109210.

The product of its (nonzero) digits is 4536000, while the sum is 53.

The spelling of 21457565110439 in words is "twenty-one trillion, four hundred fifty-seven billion, five hundred sixty-five million, one hundred ten thousand, four hundred thirty-nine".