21202031033 has 4 divisors (see below), whose sum is σ = 21319169508. Its totient is φ = 21084892560.

The previous prime is 21202031029. The next prime is 21202031047. The reversal of 21202031033 is 33013020212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 315133504 + 20886897529 = 17752^2 + 144523^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202031033 - 2² = 21202031029 is a prime.

It is a super-2 number, since 2×21202031033² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21202031533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58568966 + ... + 58569327.

It is an arithmetic number, because the mean of its divisors is an integer number (5329792377).

Almost surely, 2^21202031033 is an apocalyptic number.

It is an amenable number.

21202031033 is a deficient number, since it is larger than the sum of its proper divisors (117138475).

21202031033 is a wasteful number, since it uses less digits than its factorization.

21202031033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117138474.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21202031033 its reverse (33013020212), we get a palindrome (54215051245).

The spelling of 21202031033 in words is "twenty-one billion, two hundred two million, thirty-one thousand, thirty-three".