21311130203028 has 18 divisors (see below), whose sum is σ = 53869801346634. Its totient is φ = 7103710067664.

The previous prime is 21311130203021. The next prime is 21311130203047. The reversal of 21311130203028 is 82030203111312.

21311130203028 is a `hidden beast` number, since 21 + 31 + 1 + 1 + 302 + 0 + 302 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12510284112144 + 8800846090884 = 3536988^2 + 2966622^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 21311130202992 and 21311130203010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311130203021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 295987919451 + ... + 295987919522.

Almost surely, 2^{21311130203028} is an apocalyptic number.

It is an amenable number.

21311130203028 is an abundant number, since it is smaller than the sum of its proper divisors (32558671143606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21311130203028 is a wasteful number, since it uses less digits than its factorization.

21311130203028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591975838983 (or 591975838978 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The spelling of 21311130203028 in words is "twenty-one trillion, three hundred eleven billion, one hundred thirty million, two hundred three thousand, twenty-eight".