21311133030 has 48 divisors (see below), whose sum is σ = 60446125584. Its totient is φ = 5166335040.

The previous prime is 21311132959. The next prime is 21311133047. The reversal of 21311133030 is 3033111312.

It is a happy number.

21311133030 is a `hidden beast` number, since 21 + 311 + 1 + 330 + 3 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21311132994 and 21311133012.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 10762209 + ... + 10764188.

It is an arithmetic number, because the mean of its divisors is an integer number (1259294283).

Almost surely, 2^21311133030 is an apocalyptic number.

21311133030 is an abundant number, since it is smaller than the sum of its proper divisors (39134992554).

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

21311133030 is a wasteful number, since it uses less digits than its factorization.

21311133030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21526421 (or 21526418 counting only the distinct ones).

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

Adding to 21311133030 its reverse (3033111312), we get a palindrome (24344244342).

The spelling of 21311133030 in words is "twenty-one billion, three hundred eleven million, one hundred thirty-three thousand, thirty".