21024455441 has 8 divisors (see below), whose sum is σ = 24284932704. Its totient is φ = 17988838720.

The previous prime is 21024455399. The next prime is 21024455443. The reversal of 21024455441 is 14455442012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21024455441 - 2³⁴ = 3844586257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21024455398 and 21024455407.

It is not an unprimeable number, because it can be changed into a prime (21024455443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56214935 + ... + 56215308.

It is an arithmetic number, because the mean of its divisors is an integer number (3035616588).

Almost surely, 2^21024455441 is an apocalyptic number.

It is an amenable number.

21024455441 is a deficient number, since it is larger than the sum of its proper divisors (3260477263).

21024455441 is a wasteful number, since it uses less digits than its factorization.

21024455441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112430271.

The product of its (nonzero) digits is 25600, while the sum is 32.

Adding to 21024455441 its reverse (14455442012), we get a palindrome (35479897453).

The spelling of 21024455441 in words is "twenty-one billion, twenty-four million, four hundred fifty-five thousand, four hundred forty-one".