21103303131 has 24 divisors (see below), whose sum is σ = 30586701600. Its totient is φ = 14020884096.

The previous prime is 21103303099. The next prime is 21103303139. The reversal of 21103303131 is 13130330112.

It is a happy number.

21103303131 is a `hidden beast` number, since 21 + 1 + 0 + 330 + 313 + 1 = 666.

It is not a de Polignac number, because 21103303131 - 2⁵ = 21103303099 is a prime.

It is a super-2 number, since 2×21103303131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21103303139) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3605095 + ... + 3610943.

It is an arithmetic number, because the mean of its divisors is an integer number (1274445900).

Almost surely, 2^21103303131 is an apocalyptic number.

21103303131 is a deficient number, since it is larger than the sum of its proper divisors (9483398469).

21103303131 is a wasteful number, since it uses less digits than its factorization.

21103303131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7155 (or 7152 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

Adding to 21103303131 its reverse (13130330112), we get a palindrome (34233633243).

The spelling of 21103303131 in words is "twenty-one billion, one hundred three million, three hundred three thousand, one hundred thirty-one".