21442033433 has 4 divisors (see below), whose sum is σ = 21444646068. Its totient is φ = 21439420800.

The previous prime is 21442033423. The next prime is 21442033597. The reversal of 21442033433 is 33433024412.

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 5141893849 + 16300139584 = 71707^2 + 127672^2 .

It is a cyclic number.

It is not a de Polignac number, because 21442033433 - 2¹² = 21442029337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21442033396 and 21442033405.

It is not an unprimeable number, because it can be changed into a prime (21442033423) 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, 1293968 + ... + 1310433.

It is an arithmetic number, because the mean of its divisors is an integer number (5361161517).

Almost surely, 2^21442033433 is an apocalyptic number.

It is an amenable number.

21442033433 is a deficient number, since it is larger than the sum of its proper divisors (2612635).

21442033433 is an equidigital number, since it uses as much as digits as its factorization.

21442033433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2612634.

The product of its (nonzero) digits is 20736, while the sum is 29.

Adding to 21442033433 its reverse (33433024412), we get a palindrome (54875057845).

The spelling of 21442033433 in words is "twenty-one billion, four hundred forty-two million, thirty-three thousand, four hundred thirty-three".