21200612033 has 4 divisors (see below), whose sum is σ = 21221541588. Its totient is φ = 21179682480.

The previous prime is 21200612029. The next prime is 21200612047. The reversal of 21200612033 is 33021600212.

It is a happy number.

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 885241009 + 20315371024 = 29753^2 + 142532^2 .

It is a cyclic number.

It is not a de Polignac number, because 21200612033 - 2² = 21200612029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21200611996 and 21200612014.

It is not an unprimeable number, because it can be changed into a prime (21200612003) 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, 10463258 + ... + 10465283.

It is an arithmetic number, because the mean of its divisors is an integer number (5305385397).

Almost surely, 2^21200612033 is an apocalyptic number.

It is an amenable number.

21200612033 is a deficient number, since it is larger than the sum of its proper divisors (20929555).

21200612033 is a wasteful number, since it uses less digits than its factorization.

21200612033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20929554.

The product of its (nonzero) digits is 432, while the sum is 20.

The spelling of 21200612033 in words is "twenty-one billion, two hundred million, six hundred twelve thousand, thirty-three".