21150420433 has 8 divisors (see below), whose sum is σ = 21682260936. Its totient is φ = 20619340800.

The previous prime is 21150420419. The next prime is 21150420479. The reversal of 21150420433 is 33402405112.

It can be written as a sum of positive squares in 4 ways, for example, as 954315664 + 20196104769 = 30892^2 + 142113^2 .

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 21150420433 - 2⁹ = 21150419921 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21150420398 and 21150420407.

It is not an unprimeable number, because it can be changed into a prime (21150420493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133716 + ... + 245317.

It is an arithmetic number, because the mean of its divisors is an integer number (2710282617).

Almost surely, 2^21150420433 is an apocalyptic number.

It is an amenable number.

21150420433 is a deficient number, since it is larger than the sum of its proper divisors (531840503).

21150420433 is a wasteful number, since it uses less digits than its factorization.

21150420433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380435.

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21150420433 its reverse (33402405112), we get a palindrome (54552825545).

The spelling of 21150420433 in words is "twenty-one billion, one hundred fifty million, four hundred twenty thousand, four hundred thirty-three".