21011301 has 12 divisors (see below), whose sum is σ = 31170412. Its totient is φ = 13628736.

The previous prime is 21011299. The next prime is 21011317. The reversal of 21011301 is 10311012.

It can be written as a sum of positive squares in 2 ways, for example, as 7834401 + 13176900 = 2799^2 + 3630^2 .

It is not a de Polignac number, because 21011301 - 2¹ = 21011299 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31216 + ... + 31881.

Almost surely, 2^21011301 is an apocalyptic number.

It is an amenable number.

21011301 is a deficient number, since it is larger than the sum of its proper divisors (10159111).

21011301 is a wasteful number, since it uses less digits than its factorization.

21011301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63140 (or 63137 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 21011301 is about 4583.8085693013. The cubic root of 21011301 is about 275.9418986079.

Adding to 21011301 its reverse (10311012), we get a palindrome (31322313).

It can be divided in two parts, 21011 and 301, that added together give a palindrome (21312).

The spelling of 21011301 in words is "twenty-one million, eleven thousand, three hundred one".