21001030033 has 4 divisors (see below), whose sum is σ = 21152116720. Its totient is φ = 20849943348.

The previous prime is 21001030027. The next prime is 21001030051. The reversal of 21001030033 is 33003010012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21001030033 - 2²¹ = 20998932881 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21001029995 and 21001030022.

It is not an unprimeable number, because it can be changed into a prime (21001030093) 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, 75543135 + ... + 75543412.

It is an arithmetic number, because the mean of its divisors is an integer number (5288029180).

Almost surely, 2^21001030033 is an apocalyptic number.

It is an amenable number.

21001030033 is a deficient number, since it is larger than the sum of its proper divisors (151086687).

21001030033 is a wasteful number, since it uses less digits than its factorization.

21001030033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151086686.

The product of its (nonzero) digits is 54, while the sum is 13.

Adding to 21001030033 its reverse (33003010012), we get a palindrome (54004040045).

The spelling of 21001030033 in words is "twenty-one billion, one million, thirty thousand, thirty-three".