21255440301 has 12 divisors (see below), whose sum is σ = 31205619900. Its totient is φ = 13937993280.

The previous prime is 21255440299. The next prime is 21255440303. The reversal of 21255440301 is 10304455212.

21255440301 is a `hidden beast` number, since 2 + 1 + 255 + 4 + 403 + 0 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (21255440299) and next prime (21255440303).

It can be written as a sum of positive squares in 2 ways, for example, as 1084055625 + 20171384676 = 32925^2 + 142026^2 .

It is not a de Polignac number, because 21255440301 - 2¹ = 21255440299 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21255440303) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19357776 + ... + 19358873.

It is an arithmetic number, because the mean of its divisors is an integer number (2600468325).

Almost surely, 2^21255440301 is an apocalyptic number.

It is an amenable number.

21255440301 is a deficient number, since it is larger than the sum of its proper divisors (9950179599).

21255440301 is a wasteful number, since it uses less digits than its factorization.

21255440301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38716716 (or 38716713 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 21255440301 its reverse (10304455212), we get a palindrome (31559895513).

The spelling of 21255440301 in words is "twenty-one billion, two hundred fifty-five million, four hundred forty thousand, three hundred one".