21441510514145 has 4 divisors (see below), whose sum is σ = 25729812616980. Its totient is φ = 17153208411312.

The previous prime is 21441510514093. The next prime is 21441510514153. The reversal of 21441510514145 is 54141501514412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10184472281344 + 11257038232801 = 3191312^2 + 3355151^2 .

It is a cyclic number.

It is not a de Polignac number, because 21441510514145 - 2¹⁶ = 21441510448609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21441510514099 and 21441510514108.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2144151051410 + ... + 2144151051419.

It is an arithmetic number, because the mean of its divisors is an integer number (6432453154245).

Almost surely, 2^{21441510514145} is an apocalyptic number.

It is an amenable number.

21441510514145 is a deficient number, since it is larger than the sum of its proper divisors (4288302102835).

21441510514145 is an equidigital number, since it uses as much as digits as its factorization.

21441510514145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4288302102834.

The product of its (nonzero) digits is 64000, while the sum is 38.

The spelling of 21441510514145 in words is "twenty-one trillion, four hundred forty-one billion, five hundred ten million, five hundred fourteen thousand, one hundred forty-five".