21033001031 has 12 divisors (see below), whose sum is σ = 24469900272. Its totient is φ = 18026120448.

The previous prime is 21033000953. The next prime is 21033001057. The reversal of 21033001031 is 13010033012.

It is not a de Polignac number, because 21033001031 - 2¹⁰ = 21033000007 is a prime.

It is a super-2 number, since 2×21033001031² (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 = 21033000997 and 21033001015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033001831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 490646 + ... + 531788.

It is an arithmetic number, because the mean of its divisors is an integer number (2039158356).

Almost surely, 2^21033001031 is an apocalyptic number.

21033001031 is a deficient number, since it is larger than the sum of its proper divisors (3436899241).

21033001031 is a wasteful number, since it uses less digits than its factorization.

21033001031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51590 (or 51583 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 14.

Adding to 21033001031 its reverse (13010033012), we get a palindrome (34043034043).

The spelling of 21033001031 in words is "twenty-one billion, thirty-three million, one thousand, thirty-one".