21031033311 has 12 divisors (see below), whose sum is σ = 30382455480. Its totient is φ = 14018706000.

The previous prime is 21031033279. The next prime is 21031033321. The reversal of 21031033311 is 11333013012.

It is a happy number.

21031033311 is a `hidden beast` number, since 2 + 10 + 310 + 33 + 311 = 666.

It is not a de Polignac number, because 21031033311 - 2⁵ = 21031033279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031033321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96565 + ... + 226686.

It is an arithmetic number, because the mean of its divisors is an integer number (2531871290).

Almost surely, 2^21031033311 is an apocalyptic number.

21031033311 is a deficient number, since it is larger than the sum of its proper divisors (9351422169).

21031033311 is a wasteful number, since it uses less digits than its factorization.

21031033311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330486 (or 330483 counting only the distinct ones).

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

Adding to 21031033311 its reverse (11333013012), we get a palindrome (32364046323).

The spelling of 21031033311 in words is "twenty-one billion, thirty-one million, thirty-three thousand, three hundred eleven".