21004300051 has 16 divisors (see below), whose sum is σ = 25084988928. Its totient is φ = 17195904000.

The previous prime is 21004300049. The next prime is 21004300073. The reversal of 21004300051 is 15000340012.

It is not a de Polignac number, because 21004300051 - 2¹ = 21004300049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21004299998 and 21004300034.

It is not an unprimeable number, because it can be changed into a prime (21004300081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16851 + ... + 205651.

It is an arithmetic number, because the mean of its divisors is an integer number (1567811808).

Almost surely, 2^21004300051 is an apocalyptic number.

21004300051 is a deficient number, since it is larger than the sum of its proper divisors (4080688877).

21004300051 is a wasteful number, since it uses less digits than its factorization.

21004300051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189522.

The product of its (nonzero) digits is 120, while the sum is 16.

Adding to 21004300051 its reverse (15000340012), we get a palindrome (36004640063).

The spelling of 21004300051 in words is "twenty-one billion, four million, three hundred thousand, fifty-one".