21120333231 has 32 divisors (see below), whose sum is σ = 30436855488. Its totient is φ = 12978339840.

The previous prime is 21120333203. The next prime is 21120333277. The reversal of 21120333231 is 13233302112.

It is not a de Polignac number, because 21120333231 - 2¹⁵ = 21120300463 is a prime.

It is a super-2 number, since 2×21120333231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21120333198 and 21120333207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120333431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 710295 + ... + 739431.

It is an arithmetic number, because the mean of its divisors is an integer number (951151734).

Almost surely, 2^21120333231 is an apocalyptic number.

21120333231 is a deficient number, since it is larger than the sum of its proper divisors (9316522257).

21120333231 is a wasteful number, since it uses less digits than its factorization.

21120333231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29451.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21120333231 its reverse (13233302112), we get a palindrome (34353635343).

The spelling of 21120333231 in words is "twenty-one billion, one hundred twenty million, three hundred thirty-three thousand, two hundred thirty-one".