21011003201 has 4 divisors (see below), whose sum is σ = 21012380592. Its totient is φ = 21009625812.

The previous prime is 21011003197. The next prime is 21011003203. The reversal of 21011003201 is 10230011012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21011003201 - 2² = 21011003197 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21011003203) 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 3 ways as a sum of consecutive naturals, for example, 665555 + ... + 696408.

It is an arithmetic number, because the mean of its divisors is an integer number (5253095148).

Almost surely, 2^21011003201 is an apocalyptic number.

It is an amenable number.

21011003201 is a deficient number, since it is larger than the sum of its proper divisors (1377391).

21011003201 is a wasteful number, since it uses less digits than its factorization.

21011003201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1377390.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 21011003201 its reverse (10230011012), we get a palindrome (31241014213).

The spelling of 21011003201 in words is "twenty-one billion, eleven million, three thousand, two hundred one".