21110133331 has 16 divisors (see below), whose sum is σ = 25935989760. Its totient is φ = 16777333440.

The previous prime is 21110133323. The next prime is 21110133337. The reversal of 21110133331 is 13333101112.

It is not a de Polignac number, because 21110133331 - 2³ = 21110133323 is a prime.

It is a super-2 number, since 2×21110133331² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21110133299 and 21110133308.

It is not an unprimeable number, because it can be changed into a prime (21110133337) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1682290 + ... + 1694791.

It is an arithmetic number, because the mean of its divisors is an integer number (1620999360).

Almost surely, 2^21110133331 is an apocalyptic number.

21110133331 is a deficient number, since it is larger than the sum of its proper divisors (4825856429).

21110133331 is a wasteful number, since it uses less digits than its factorization.

21110133331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3377154.

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 21110133331 its reverse (13333101112), we get a palindrome (34443234443).

The spelling of 21110133331 in words is "twenty-one billion, one hundred ten million, one hundred thirty-three thousand, three hundred thirty-one".