21010033 has 8 divisors (see below), whose sum is σ = 23659776. Its totient is φ = 18483600.

The previous prime is 21010013. The next prime is 21010037. The reversal of 21010033 is 33001012.

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 21010033 - 2¹⁷ = 20878961 is a prime.

It is a super-2 number, since 2×21010033² = 882842973322178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010037) 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, 30466 + ... + 31147.

It is an arithmetic number, because the mean of its divisors is an integer number (2957472).

Almost surely, 2^21010033 is an apocalyptic number.

It is an amenable number.

21010033 is a deficient number, since it is larger than the sum of its proper divisors (2649743).

21010033 is a wasteful number, since it uses less digits than its factorization.

21010033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61655.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 21010033 is about 4583.6702542831. The cubic root of 21010033 is about 275.9363476052.

Adding to 21010033 its reverse (33001012), we get a palindrome (54011045).

The spelling of 21010033 in words is "twenty-one million, ten thousand, thirty-three".