21021000241 has 4 divisors (see below), whose sum is σ = 21042085492. Its totient is φ = 20999914992.

The previous prime is 21021000223. The next prime is 21021000277. The reversal of 21021000241 is 14200012012.

It is a happy number.

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 16811715600 + 4209284641 = 129660^2 + 64879^2 .

It is a cyclic number.

It is not a de Polignac number, because 21021000241 - 2¹³ = 21020992049 is a prime.

It is a super-3 number, since 3×21021000241³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021000041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10541130 + ... + 10543123.

It is an arithmetic number, because the mean of its divisors is an integer number (5260521373).

Almost surely, 2^21021000241 is an apocalyptic number.

It is an amenable number.

21021000241 is a deficient number, since it is larger than the sum of its proper divisors (21085251).

21021000241 is an equidigital number, since it uses as much as digits as its factorization.

21021000241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21085250.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21021000241 its reverse (14200012012), we get a palindrome (35221012253).

The spelling of 21021000241 in words is "twenty-one billion, twenty-one million, two hundred forty-one", and thus it is an aban number.