21454144443 has 18 divisors (see below), whose sum is σ = 32706184524. Its totient is φ = 13549983912.

The previous prime is 21454144373. The next prime is 21454144451. The reversal of 21454144443 is 34444145412.

21454144443 is a `hidden beast` number, since 21 + 4 + 54 + 144 + 443 = 666.

It is not a de Polignac number, because 21454144443 - 2¹³ = 21454136251 is a prime.

It is a super-2 number, since 2×21454144443² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21454144398 and 21454144407.

It is not an unprimeable number, because it can be changed into a prime (21454644443) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3298405 + ... + 3304902.

Almost surely, 2^21454144443 is an apocalyptic number.

21454144443 is a deficient number, since it is larger than the sum of its proper divisors (11252040081).

21454144443 is a wasteful number, since it uses less digits than its factorization.

21454144443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6603351 (or 6603329 counting only the distinct ones).

The product of its digits is 122880, while the sum is 36.

Adding to 21454144443 its reverse (34444145412), we get a palindrome (55898289855).

The spelling of 21454144443 in words is "twenty-one billion, four hundred fifty-four million, one hundred forty-four thousand, four hundred forty-three".