21055431303 has 32 divisors (see below), whose sum is σ = 31739385600. Its totient is φ = 13791448800.

The previous prime is 21055431283. The next prime is 21055431349. The reversal of 21055431303 is 30313455012.

21055431303 is a `hidden beast` number, since 2 + 105 + 543 + 13 + 0 + 3 = 666.

It is not a de Polignac number, because 21055431303 - 2⁹ = 21055430791 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21055431503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5702688 + ... + 5706378.

It is an arithmetic number, because the mean of its divisors is an integer number (991855800).

Almost surely, 2^21055431303 is an apocalyptic number.

21055431303 is a deficient number, since it is larger than the sum of its proper divisors (10683954297).

21055431303 is a wasteful number, since it uses less digits than its factorization.

21055431303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7340 (or 7334 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

Adding to 21055431303 its reverse (30313455012), we get a palindrome (51368886315).

The spelling of 21055431303 in words is "twenty-one billion, fifty-five million, four hundred thirty-one thousand, three hundred three".