21033331031 has 8 divisors (see below), whose sum is σ = 21199926384. Its totient is φ = 20867388480.

The previous prime is 21033331027. The next prime is 21033331043. The reversal of 21033331031 is 13013333012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21033331031 - 2² = 21033331027 is a prime.

It is a super-2 number, since 2×21033331031² (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 = 21033330994 and 21033331012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033331831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98405 + ... + 227486.

It is an arithmetic number, because the mean of its divisors is an integer number (2649990798).

Almost surely, 2^21033331031 is an apocalyptic number.

21033331031 is a deficient number, since it is larger than the sum of its proper divisors (166595353).

21033331031 is a wasteful number, since it uses less digits than its factorization.

21033331031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326401.

The product of its (nonzero) digits is 486, while the sum is 20.

Adding to 21033331031 its reverse (13013333012), we get a palindrome (34046664043).

The spelling of 21033331031 in words is "twenty-one billion, thirty-three million, three hundred thirty-one thousand, thirty-one".