21021010201 has 8 divisors (see below), whose sum is σ = 21113868680. Its totient is φ = 20928316032.

The previous prime is 21021010181. The next prime is 21021010249. The reversal of 21021010201 is 10201012012.

It can be written as a sum of positive squares in 4 ways, for example, as 1070860176 + 19950150025 = 32724^2 + 141245^2 .

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 21021010201 - 2²¹ = 21018913049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021013201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218971 + ... + 299983.

It is an arithmetic number, because the mean of its divisors is an integer number (2639233585).

Almost surely, 2^21021010201 is an apocalyptic number.

It is an amenable number.

21021010201 is a deficient number, since it is larger than the sum of its proper divisors (92858479).

21021010201 is an equidigital number, since it uses as much as digits as its factorization.

21021010201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82155.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21021010201 its reverse (10201012012), we get a palindrome (31222022213).

The spelling of 21021010201 in words is "twenty-one billion, twenty-one million, ten thousand, two hundred one".