21033115331 has 16 divisors (see below), whose sum is σ = 22578082560. Its totient is φ = 19556103840.

The previous prime is 21033115283. The next prime is 21033115357. The reversal of 21033115331 is 13351133012.

It is a cyclic number.

It is not a de Polignac number, because 21033115331 - 2⁶ = 21033115267 is a prime.

It is a super-2 number, since 2×21033115331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21033115297 and 21033115306.

It is not an unprimeable number, because it can be changed into a prime (21033115361) 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, 30245 + ... + 207318.

It is an arithmetic number, because the mean of its divisors is an integer number (1411130160).

Almost surely, 2^21033115331 is an apocalyptic number.

21033115331 is a deficient number, since it is larger than the sum of its proper divisors (1544967229).

21033115331 is a wasteful number, since it uses less digits than its factorization.

21033115331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237706.

The product of its (nonzero) digits is 810, while the sum is 23.

Adding to 21033115331 its reverse (13351133012), we get a palindrome (34384248343).

The spelling of 21033115331 in words is "twenty-one billion, thirty-three million, one hundred fifteen thousand, three hundred thirty-one".