21444016455151 has 4 divisors (see below), whose sum is σ = 21450516615000. Its totient is φ = 21437516295304.

The previous prime is 21444016455107. The next prime is 21444016455157. The reversal of 21444016455151 is 15155461044412.

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

It is a cyclic number.

It is not a de Polignac number, because 21444016455151 - 2¹⁵ = 21444016422383 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21444016455098 and 21444016455107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444016455157) 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, 3250074976 + ... + 3250081573.

It is an arithmetic number, because the mean of its divisors is an integer number (5362629153750).

Almost surely, 2^{21444016455151} is an apocalyptic number.

21444016455151 is a deficient number, since it is larger than the sum of its proper divisors (6500159849).

21444016455151 is an equidigital number, since it uses as much as digits as its factorization.

21444016455151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6500159848.

The product of its (nonzero) digits is 384000, while the sum is 43.

Adding to 21444016455151 its reverse (15155461044412), we get a palindrome (36599477499563).

The spelling of 21444016455151 in words is "twenty-one trillion, four hundred forty-four billion, sixteen million, four hundred fifty-five thousand, one hundred fifty-one".