21043024401 has 16 divisors (see below), whose sum is σ = 32121152384. Its totient is φ = 12003738624.

The previous prime is 21043024391. The next prime is 21043024447. The reversal of 21043024401 is 10442034012.

It is not a de Polignac number, because 21043024401 - 2⁷ = 21043024273 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21043004401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 856210 + ... + 880443.

It is an arithmetic number, because the mean of its divisors is an integer number (2007572024).

Almost surely, 2^21043024401 is an apocalyptic number.

21043024401 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21043024401 is a deficient number, since it is larger than the sum of its proper divisors (11078127983).

21043024401 is a wasteful number, since it uses less digits than its factorization.

21043024401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1737240.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21043024401 its reverse (10442034012), we get a palindrome (31485058413).

The spelling of 21043024401 in words is "twenty-one billion, forty-three million, twenty-four thousand, four hundred one".