21240552303 has 12 divisors (see below), whose sum is σ = 30688087248. Its totient is φ = 14157003840.

The previous prime is 21240552287. The next prime is 21240552391. The reversal of 21240552303 is 30325504212.

It is a happy number.

21240552303 is a `hidden beast` number, since 21 + 2 + 405 + 5 + 230 + 3 = 666.

It is not a de Polignac number, because 21240552303 - 2⁴ = 21240552287 is a prime.

It is a super-2 number, since 2×21240552303² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21240552103) 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, 240075 + ... + 316412.

It is an arithmetic number, because the mean of its divisors is an integer number (2557340604).

Almost surely, 2^21240552303 is an apocalyptic number.

21240552303 is a deficient number, since it is larger than the sum of its proper divisors (9447534945).

21240552303 is a wasteful number, since it uses less digits than its factorization.

21240552303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560734 (or 560731 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The spelling of 21240552303 in words is "twenty-one billion, two hundred forty million, five hundred fifty-two thousand, three hundred three".