21042203331 has 16 divisors (see below), whose sum is σ = 28481131008. Its totient is φ = 13816118400.

The previous prime is 21042203323. The next prime is 21042203383. The reversal of 21042203331 is 13330224012.

It is not a de Polignac number, because 21042203331 - 2³ = 21042203323 is a prime.

It is a super-2 number, since 2×21042203331² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21042203298 and 21042203307.

It is not an unprimeable number, because it can be changed into a prime (21042273331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154891 + ... + 257051.

It is an arithmetic number, because the mean of its divisors is an integer number (1780070688).

Almost surely, 2^21042203331 is an apocalyptic number.

21042203331 is a deficient number, since it is larger than the sum of its proper divisors (7438927677).

21042203331 is a wasteful number, since it uses less digits than its factorization.

21042203331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103202.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21042203331 its reverse (13330224012), we get a palindrome (34372427343).

The spelling of 21042203331 in words is "twenty-one billion, forty-two million, two hundred three thousand, three hundred thirty-one".