21044200451 has 8 divisors (see below), whose sum is σ = 21962764320. Its totient is φ = 20125936512.

The previous prime is 21044200427. The next prime is 21044200477. The reversal of 21044200451 is 15400244012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21044200451 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21044280451) 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 7 ways as a sum of consecutive naturals, for example, 74795 + ... + 218363.

It is an arithmetic number, because the mean of its divisors is an integer number (2745345540).

Almost surely, 2^21044200451 is an apocalyptic number.

21044200451 is a deficient number, since it is larger than the sum of its proper divisors (918563869).

21044200451 is a wasteful number, since it uses less digits than its factorization.

21044200451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149965.

The product of its (nonzero) digits is 1280, while the sum is 23.

Adding to 21044200451 its reverse (15400244012), we get a palindrome (36444444463).

The spelling of 21044200451 in words is "twenty-one billion, forty-four million, two hundred thousand, four hundred fifty-one".