21033420353 has 8 divisors (see below), whose sum is σ = 23736775680. Its totient is φ = 18461936080.

The previous prime is 21033420329. The next prime is 21033420367. The reversal of 21033420353 is 35302433012.

It is a happy number.

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 21033420353 - 2¹⁶ = 21033354817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21033420383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32967425 + ... + 32968062.

It is an arithmetic number, because the mean of its divisors is an integer number (2967096960).

Almost surely, 2^21033420353 is an apocalyptic number.

It is an amenable number.

21033420353 is a deficient number, since it is larger than the sum of its proper divisors (2703355327).

21033420353 is a wasteful number, since it uses less digits than its factorization.

21033420353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65935527.

The product of its (nonzero) digits is 6480, while the sum is 26.

Adding to 21033420353 its reverse (35302433012), we get a palindrome (56335853365).

The spelling of 21033420353 in words is "twenty-one billion, thirty-three million, four hundred twenty thousand, three hundred fifty-three".