21375144114457 has 4 divisors (see below), whose sum is σ = 24428736130816. Its totient is φ = 18321552098100.

The previous prime is 21375144114437. The next prime is 21375144114463. The reversal of 21375144114457 is 75441144157312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21375144114457 - 2¹⁵ = 21375144081689 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21375144114457.

It is not an unprimeable number, because it can be changed into a prime (21375144114437) 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, 1526796008169 + ... + 1526796008182.

It is an arithmetic number, because the mean of its divisors is an integer number (6107184032704).

Almost surely, 2^{21375144114457} is an apocalyptic number.

It is an amenable number.

21375144114457 is a deficient number, since it is larger than the sum of its proper divisors (3053592016359).

21375144114457 is an equidigital number, since it uses as much as digits as its factorization.

21375144114457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3053592016358.

The product of its digits is 1881600, while the sum is 49.

The spelling of 21375144114457 in words is "twenty-one trillion, three hundred seventy-five billion, one hundred forty-four million, one hundred fourteen thousand, four hundred fifty-seven".