21003451201 has 4 divisors (see below), whose sum is σ = 21003836292. Its totient is φ = 21003066112.

The previous prime is 21003451171. The next prime is 21003451229. The reversal of 21003451201 is 10215430012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4670355600 + 16333095601 = 68340^2 + 127801^2 .

It is a cyclic number.

It is not a de Polignac number, because 21003451201 - 2⁵ = 21003451169 is a prime.

It is a super-2 number, since 2×21003451201² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21003457201) 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 3 ways as a sum of consecutive naturals, for example, 93880 + ... + 225433.

It is an arithmetic number, because the mean of its divisors is an integer number (5250959073).

Almost surely, 2^21003451201 is an apocalyptic number.

It is an amenable number.

21003451201 is a deficient number, since it is larger than the sum of its proper divisors (385091).

21003451201 is an equidigital number, since it uses as much as digits as its factorization.

21003451201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385090.

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 21003451201 its reverse (10215430012), we get a palindrome (31218881213).

The spelling of 21003451201 in words is "twenty-one billion, three million, four hundred fifty-one thousand, two hundred one".