21033231033 has 8 divisors (see below), whose sum is σ = 28082260000. Its totient is φ = 14003178048.

The previous prime is 21033231029. The next prime is 21033231067. The reversal of 21033231033 is 33013233012.

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

It is not a de Polignac number, because 21033231033 - 2² = 21033231029 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21033231533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4741408 + ... + 4745841.

It is an arithmetic number, because the mean of its divisors is an integer number (3510282500).

Almost surely, 2^21033231033 is an apocalyptic number.

It is an amenable number.

21033231033 is a deficient number, since it is larger than the sum of its proper divisors (7049028967).

21033231033 is an equidigital number, since it uses as much as digits as its factorization.

21033231033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9487991.

The product of its (nonzero) digits is 972, while the sum is 21.

Adding to 21033231033 its reverse (33013233012), we get a palindrome (54046464045).

The spelling of 21033231033 in words is "twenty-one billion, thirty-three million, two hundred thirty-one thousand, thirty-three".