21242113033 has 4 divisors (see below), whose sum is σ = 21384677700. Its totient is φ = 21099548368.

The previous prime is 21242113007. The next prime is 21242113063. The reversal of 21242113033 is 33031124212.

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 13108418064 + 8133694969 = 114492^2 + 90187^2 .

It is a cyclic number.

It is not a de Polignac number, because 21242113033 - 2⁵ = 21242113001 is a prime.

It is a super-2 number, since 2×21242113033² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21242112995 and 21242113013.

It is not an unprimeable number, because it can be changed into a prime (21242113063) 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, 71282110 + ... + 71282407.

It is an arithmetic number, because the mean of its divisors is an integer number (5346169425).

Almost surely, 2^21242113033 is an apocalyptic number.

It is an amenable number.

21242113033 is a deficient number, since it is larger than the sum of its proper divisors (142564667).

21242113033 is a wasteful number, since it uses less digits than its factorization.

21242113033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142564666.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21242113033 its reverse (33031124212), we get a palindrome (54273237245).

The spelling of 21242113033 in words is "twenty-one billion, two hundred forty-two million, one hundred thirteen thousand, thirty-three".